Meyer Hard Rubber mouthpieces seem to be a pretty standard jazz mouthpiece especially for alto. They seem to work for most people and have a pretty warm full sound. The most important thing about choosing a mouthpiece is trying it out so find a music store that has a good selection and try a bunch out. Bring your piece in and hopefully someone working there will be able to guide you on what tip openings you should try, better yet bring your teacher along if you can. Good luck.