I am 6'0"-6'1". Thank you guys so much for the help, but as you can pretty much guess, I am kinda clueless in the gym with names of things and what to do. Plus I am very organized in life.

So could you guys help me with a training program and what to do at the gym like step by step maybe?

I guess the reason I never wanted to do my legs is because I play tennis and I run as well, and I just don't always want them aching when I do that. I know it's a bad reason....