Don't worry about how many "tricks" you can learn but more, how many techniques you can focus on and master first. Technique is far more important that single effects. But, as Rick has mentioned, it's just a matter of time and getting a taste of the various avenues that magic has; cards, coins, ropes, silks, gambling routines, classic manipulation, etc. Learn all you can but pace yourself so that you do more than learn a secret, actually LEARN all you can about each effect, especially those that really appeal to you. For an example, Coin Matrix; learn all the different variations of doing that effect with and without gimmicks.
Take a niche area and give yourself six months of working with it and really dig deep to learn all you can about that niche and then, at the end of that time shift to another area that appeals to you for another 3-6 months. Do this and within a few short years you will have some awesome skills as well as strong knowledge; knowledge that will empower you to pull off literal improvisational miracles.
Stay away from Mentalism until you have some performance experience, it is an area that requires some solid showmanship skills that only come by working with the foundations of the craft -- stage craft.
Best of luck