Start at Beginner Stage 2 if form is poor and a long time off?

I was wondering if I should start at Beginner 2 in my current situation. I am unsure of my training maxes because I haven't really been doing much training (mostly just maintenance work for looks). My form also needs a lot of work as it is inconsistent.

Does anyone recommend that I use this program to establish some maxes and then move on the appropriate routine?

If I had to guess, I would say 315/275/405 squat/bench/deadlift

I think you're past the beginner stage, even with time off. You can always work on technique with any program too. I'd go with either the 3-day or 4-day program and not the one here.