Congrats on getting back into the sport! We need more like you.
As far as gear goes you don't need the latest and greatest gear. It's the Indian not the arrow (are we still allowed to say that?, ugh). Anyhow, "detachable" or hardshell bindings are my choice for sure. But they are a bit unforgiving for and make the ski more responsive. I do think they are safer though. Jeff Rogers still uses rubber bindings and a vest from when breakdancing was cool (well, I thought it was cool).
As for fitness, get a copy of P90X. It's fantastic. Also, try going low carb. I'm a keto guy and it works for me.