Workout routine! need help!!!!?

okay, i just started going to the gym, and im 20 years old. but i have one problem. when i go there. i dont know what machines to use so i just do everything. also i dont want to get a trainer so i was wondering if anyone has a really good workout routine. or a website that shows one? pleaseeeee! thank you... i mean im not tryying to get really big. i am 155 pounds and i want to have big not not too big muscles so please help me out thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!…