Our opening range from LP (late position - CO cutoff and BT button) can be wide. We can open low pocket pairs, any suited A, sometimes any A if the table is really weak. Heck maybe even K-rag-suited. That would be really big balls but my motto: when playing at a table of fish, commit atrocity from the button. If you are a newer player practicing this strategy maybe not go quite so wide until you are more comfortable playing aggressive with a wide range. Our EP (early position - SB BB UtG) opening range will be very tight. Our MP (middle position - all seats between UtG and CO) will be a bit looser than EP but significantly tighter than LP.
Remember that all of the crap at the bottom of our LP opening range is FOLDED if someone opens before us.
If we open A7s from the BT and UtG limp-calls we likely have a hand that competes with him. and since we have position, we also have the option to c-bet
bluff this dude when he checks the flop to us. 90%ish chance (depending on how call-y he is) that he has nothing and folds. Abuse position. : )
But be careful if the SB or BB defends. Now if SB or BB is a fish, we probably have the same situation as if the UtG limp-calls (UtG limp-calling is 100% a fish!), but if SB or BB is a good player, he will often only defend tight and A7s is in trouble here. So just beware of that.