Since you are just starting out, I'd say to pick one core exercise for legs;back squats or deadlifts while standing on a platform.Work legs at most twice per week and concentrate on your form.Once your form is solid, start to gradually add weight to the bar and maybe incorporate some additional exercises like lunges or hack squats.Maybe use a 5x5 rep scheme, with the first 2 sets being warm ups and the last 3 sets being your work sets.Use the same poundage for all three work sets.This will limit your poundage, but at this point, form is more important than weight.