Torn Meniscus and Tendon

I am going in for surgery on my left knee on monday itll be a meniscal repair so i will be on crutches for 2-4 weeks. I’m trying to figure out what to do after surgery training wise. I was a football player (offensive line) but because of the injury i’m going to have to to stop playing and wont be able to play in uni now. I want to start to lean out and lose my fat, im 260 6’1 pounds my goal is to drop a decent amount of weight 210ish. i’m not really sure what to do any help would be appreciated.

Ive learned a lot about rehab from Performance Place Sports Care on Youtube. There you will find a wealth of information on rehab with injuries especially with athletes and also meniscal injuries.