Good form is important, especially with squats.
When I was getting back to squatting, I stayed real light at 135lbs, and squatted 4x week for 3x10. It was just enough weight to provide some resistance, and it started to bring conditioning back.
I've had to climb back out the hole several times in my life with my lifting. It gets both easier, and harder at the same time. The weights get harder, but getting after it gets easier.