Getting back into it after a long time off and surgery? I would hit the mobility exercises and band work, for a few weeks (even longer if the surgery is a shoulder/back/knee joint) to get the body and joints loosened up / gain some flexibility for good range of motion in spite of potential scar tissue, and strengthen some of the supporting and core muscles before you get back into compounds.
Then when everything is feeling good and loose, start light on for everything, beginning with one exercise per session and slowly introducing more as you go so that you can rule out any injury or pain causers / narrow them down.