Are you asking me? I'll give my input anyway. Start at whatever weight you're comfortable with. You should try and break parallel with the squats but don't let your ass drop all the way to the floor as it puts extra stress on the knees IMO and can lead to future knee problems.
With deadlifts (regular), grap the bar with a wide grip (when I used to do 'em my hands were too close together which led to more stress onthe left side of my back than on the right and it caused back pains on that side so I had to back off of 'em for a while and figured out that that was the problem), bend at the knees and try to keep your back concave (jut stomach forward). I'm still trying to master keeping my back concave - it's harder for some than others IMO. Hope that helps.