If your legs are particularly weak, you might want to spend 3-4 weeks leg extending and curling, but it s not necessary if you have someone help you with form on squats. I ll suggest some for you. Try any combination of groups on the days you lift. For example, try chest and triceps on Monday, back and biceps on Wednesday, legs and arms on Friday. You can try any combination and see what works best for you.
Variety is very important, so experiment.
One last point. As for getting huge and looking disproportionate, if you find that that starts to happen, you can always cut back. For now, I think you ll enjoy the changes in your physique. This should get you started. If you have any questions, please post back.