First thing you have to take into account is what was the illness that caused you this. in my case, I did CT’s The complete Power Look Program and got my strongest and biggest ever. then I started gaining lots of weight and end up weighing almost 250 pounds!
It was a thyroid imbalance, 14 months later I have lost 60 pounds, of course that in the process I lost LOTS of muscle. But my pririty was not getting bigger but regulating again my thyroid axis. it would had been pretty easy to say something like…eat less! I could had been so wrong, because my body would have sensed that as “famine” (so to speak) and my metabolism could have gone even slower!
So, be careful and take into account A LOT what was your diagnosis and if you are prone to cerating things after this happened to you.
Regarding training I would just tell you to focus first on the quality of your posture and movement in general to detect and then correct before you start “going heavy”. it would also be advisable to check your balance, coordination and proprioception to address any issue in your first phase training, aiming it at correcting all those deficitis/imbalances corrected (core included)…Just, please, don´t buy a Bosu!
Here you can also start working towards building the foundation for the big lifts; focus strongly on technique, technique and technique, and then on muscle contraction quality.
Dont´know what does CT would think of these recommendations of mine, but he is always willing to help.
So, welcome back and enjoy your workouts!