Need Routine for Planet Fitness?

I just signed up for this gym and I was wondering what are the best exercises to do in order to build muscle? I've heard rumors that the gym is bad for accomplishing this. However there are some ripped people that go there. Can anyone that has experience with this gym give me some kind of workout routine to accomplish my goal of getting muscular and how long it will take. ---Also I can't really afford to go to another gym so please enlighten me.