You sing with the voice that you have, using the same vocal techniques that you have been taught, regardless if you are singing jazz, pop, etc. However, many classically-trained singers encounter challenges when singing other genres of music, especially jazz or pop because of their vocal training. A few classically-trained singers have been successful in singing other genres of music, because they are sufficiently intelligent to modify their vocal technique but not in any manner that is detrimental to their basic vocal technique.

If you have a voice teacher, they will (or should) tell you that with proper support, proper technique, proper practice and TIME, your vibrato will come of its own accord. If you're using enough air and support, your soft palate is raised, and your tounge is resting tension-free on the bottom of your mouth (tip should be touching the back of your bottom teeth), your vibrato will come through. When it does start to develope, it might sound all over the place ot you (I felt like I was yodeling, it sounded awful to my ears). If that happens, record yourself, and you'll hear it's not half as bad to other people as it sounds to you.

My voice teacher sometimes says to pretend to be imitating (even making fun of) an opera singer; really just play up the big, vibrato-filled sound and see if it actually helps when you're singing for real. I agree with the above, though, do NOT wiggle your chin to attempt to fake a vibrato. It looks stupid.

If you don't have a voice teacher, you MUST MUST MUST get one if you're hoping to go pro or semi-pro. Ask the choir director at your school to recommend a teacher, or call a local university and ask to speak to one of their private voice teachers. Good luck.

You will find your true vocal range when you 1. Learn basic theory about music. Meaning note names, beat patterns, and things of that nature. 2. Learn how to breath properly to support your sound. Breathing is not the complete cure for support, but it is the basis of support. No, you don't breathe from your stomach, and there's no need to stick your chest out. If you are standing erect with good posture, all of that isn't necessary. The technique is called diaphragmatic breathing. Its the way babies breathe naturally. Their tummies inflate on inhale and deflate as they exhale. They aren't "breathing" from the tummy, although it might look as if thats possible. It is how the air is placed. Somehow the older we get, we start to "high" breathe, which is not the best way to breathe. Diaphragmatic breathing is what we should use to sing and to breathe in general. Here's a repeated advice I've given on the subject.

The diaphragm is the dome shaped muscle that separates your lungs and your heart from your digestive organs. Its not a "cute little" organ, but it is located where your torso divides and is attached to the ribs, the spine, and the sternum. There is a technique involving the diaphragm which allows you to breathe to the fullest capacity needed to support singing. Now here is an exercise I share frequently.

Now diaphragmatic breathing consists not just the diaphragm. It includes all of those muscles in that area working together to create better breathing support. The diaphragm doesn't do all the work, because it works involuntary. It is what you do with the area around it that makes diaphragmatic breathing work.

Here is a frequent exercise I share in this forum. Get in front of a mirror (or if you don't feel like getting up, sit on the edge of your chair right now sitting straight up). Place your hands parallel to eachother with the tips of your middle fingers touching. Now on inhale, don't move your shoulders or upper chest. Slowly concentrate on filling your tummy with air like a balloon. Don't force it. Just do it slowly as if you are a baby (infants and toddlers use diaphragmatic breathing automatically. Watch a baby's tummy the next time they nap. That is how we all should breathe). Your middle fingers will part slightly. You should feel expansion in your tummy area, your sides, and your back. Now exhale SLOWLY. Don't blow the air out. Hiss like a snake if that keeps you from blowing all the air out. Try to conserve as much air as you can as you exhale. By the time you are done, the tips of your middle fingers will touch again.

Try this exercise over and over again, until you get the hang of it. It might be awkward for a minute, and you might feel as if you are doing it wrong because you aren't quite used to the concept. But the more you try it, the more you will get used to it. It will eventually fall in line naturally. You can use the same exercise with singing, but instead of exhaling with the HISS sound, you can sing scales. As you sing scales, continue to conserve the air you can as you go. You will get used to it.

Whatever you do, don't force it. I do it so much now, that I naturally breathe this way day to day. It is what many doctors teach to asthma and respiratory patients to help them get full use of the air they breathe. Eventually it will get into your psyche and become automatic. You also can google "diaphragmatic breathing" if you want to see visuals of how the muscles work.

Now that this is finished, you need to observe and explore your instrument. With the help of theory, you will know what notes you can and cannot sing in your range. The better tecnique you have, the more notes you will find in your range. Then you will notice a place where your voice shifts into another voice. You will observe your head and chest voice. Your tessitura and passagio will help determine what your vocal fach is (soprano, mezzo, contralto). The more you sing and understand what your voice can do, the better you'll understand what songs and genres fit your instrument. Its just a matter of process, time passing, and continued work. A voice teacher of course can help, or other singing professionals that you may know in your area.

Learning to sing is a growing process. The more you hunger and search for the right ways by knowledge, the better singer you'll become. Just have some patience and you will see a difference.