Re: set up
My 2 cents. Practice long tones for 6 months before you hunt mouthpieces regardless of you level of development.
If you spend some time working on controlling your sound you will have a much better understanding you what you are looking for and a greater ability to adjust the sound. If you can't get a full sound on a stock mouthpiece you can't get a full sound period. As far as a pro horn. I'd give the same advice. Off the soapbox.
What instrument/mouthpiece do you have. How long have you been playing? What are your plans musically? What don't you llike about your current setup?