Whats the best workout i can do and get results?

What are some good workout routines that can lose my fat around my stomach and chest I also want to take creatine and protein cuz I'm going to start working out .. I used to workout in school I was always big, broud shoulders but what I coundt get was big arms all I have are these puny arms and I could never lose belly fat and around my chest I just want to try something different I heard about p90x?..I'm nineteen 5"10 215 lbs