Did your doc say it's fine to get back into the gym? Or do you just feel like you're ready? I'd definitely run it by them in order to get clearance and an official word that you can start training again.
If you're looking to do a 5/3/1-based plan and are having health-related recovery issues, I'd scale back the daily intensity and only shoot for the target reps instead of pushing for rep PRs. Or even start with basically "deload" programming for most sessions.
With the accessory stuff, keep the overall volume relatively low/minimal until you feel like you're back in the swing of things. Keeping a lid on intensity and volume, while still pushing for gradual progress, should put recovery at the forefront while re-establishing your base.
Should go without saying that nutrition and strategic supplements will play a huge role in this. Workout nutrition (for maximum recovery and performance) as well as whatever immune system boosters you feel are appropriate (D, C, glutamine, whatever). Ample quality protein, healthy fats, and a generally anti-inflammatory diet should help as well.