jesustheult

You could to 1 set of 100 repetitions for the squat (good luck), 5 sets of 20 reps, or 10 sets of 10 reps. You could even do 6 sets of 20, 15, 10, 8, 6, and 6; or even a set of 15, 12, 10 and 8. They are all good. In fact, you could rotate what you do every few workouts, or every few months, to keep challenging yourself.
There are many types of weight benches available. It is possible that you may like most of them. However, you should keep in mind that only that piece should be selected which matches your required workouts.