Grab a copy of a proven strength program (Or ANY program that you'll be consistent at) like any beginner should. Work from the bottom and scratch your way to your strength levels again.
However, if you're not gonna be consistent about it, save yourself the money and the frustration of going to the gym in order to dropout in a couple of months.
Leave your fucking EGO at home, suck it up, load the bar with those measly 80 pounds and start squatting... And don't quit this time. Give life the finger and keep on lifting.