For what muscle group(s) should I use high weight, low reps and vice versa?

I just finished a 3-week workout routine using the perfect push-up and now I'm starting back with actual weights. My workout consists of bench, incline, and military press. Next I do bicep curls on an incline bench. Lastly, I do front and side raises to target my deltoids. Usually I mainly do high weight, low reps because I'm trying to get more mass but I was wondering: is it better do do low weight, high reps for certain muscle groups such as biceps and when doing exercises that isolate the triceps so that they're more defined? What should I do?