Just use proper form and if anything bench less than you can do but do more reps. Honestly, if anything, you're going to hurt your back when doing squats. Unless you've had a history of knee problems, the knee gets less stress than other parts of the body during squats.
110 pounds? Hahha... I only do 140 and thats pathetic.
JUst keep proper form, your not going to injure yourself from weight until you pass 200. Just make sure your form is right.
O dude, i can easily do more then 110, it's just that when we were testing our maxes a couple weeks ago i was just coming off a flu so i didn't try so he put me in the weakest group and has me doing light weights.
Oh, and the test and today were the first two times i'd ever done squats in my life.
Find the most comfortable position for the ankles, knees and hips to work together. Total weight means nothing, 110, 150, 200, 250, injuries can happen all the same. Keep the chest out, this will keep the back in proper alignment. If you are still unsure, find a reputable strength coach in your area, he should not charge a fee to look at your squat technique (as long as that is it).