BJJ + Home Workout

Hey guys. I’m going to leave the “normal” gym to join and take classes of Brazilian Jiu Jitsu as I always wanted to try it. The problem with this it’s the fact that I don’t want to lose too much muscle or something because I won’t be working out at the gym. This being said, I wanted to try and start working out at home 1/2x per week and 1h at max per day. I never worked out at home and have no equipment at this point so I wanted to know any advice or workout plan that would help and be capable of doing at home (full body or separated body parts).

Thank you for your help in advance.