The load you should be working at for your lifts is very dependent upon your goals.
If your looking to build Power, Strength, gain some Muscle (hypertropy) or build Muscular Endurance they all require a certain load range based off your 1 Rep Max or Estimated 1 Rep Max. I will go though how do a 1 Rep Max test at a later date.
Below I have outlined the basics for Power, Strength, Hypertrophy and Muscular Endurance.
Note there are other considerations you must take into account when training such as training frequency and number of exercises in a session to maximise your progress.
If you are interested in a goal specific training programme get in contact am happy to help.