I agree with the other posters..
Fundementals are what is going to get you there.
I use mouthpiece buzzing and a B.E.R.P. for tone and as far as increasing the upper register I just play there as long as I can.
Spend a lot of time with Arban's and Clarke's these are the things that will get you where you want to go.
Search this site there have been many topics posted on the very questions you are asking.
Best to you and Welcome!
