Don't do cardio AND lift, you'll waste the energy needed to build mass. Eat a bit more, lift a lot more, do High intensity training and a lot of cardio a month or two before comp season.
As for exercises, I'd do Deadlifts, squats and benchpress until you have some decent strength, these three compound exercises work pretty much every muscle if done with correct form.
After doing the compounds for 2-3months start adding some other exercises, isolations, for instance add bent over rows in, these will help build your lats and traps aswell as your forearms.