Congrats, I was pretty heavy at start up, not far off your weight at the time, a couple of stone lighter now and dropping. The bike will be fine but obviously, do aim to avoid potholes, bumps and cracks etc. You can use your arms and legs as dampers if you can't miss something slightly bumpy, just shift off the seat slightly and try and let the arms and legs work like shocks.
If I was starting again, I wouldn't mess about thinking that the tyres will help dampen things if kept at lower pressure; at first I used to put 100 psi in the rear and 90 - 95 psi in the front but realised it was not a good idea when standing to climb hills, as the front was squashing in a worrying way and I believe you'll likely puncture more if you have them too low. Best keep the pressures highish on both wheels to avoid pinches and movement (105 - 110 psi on the standard tyres will be fine). I'm now on 115 - 120 psi on new wheels and tyres.
The most disconcerting thing I didn't like about the original bike set up, when putting it under load, was the flex in the front wheel if climbing reasonably vigorously when standing up (you don't have to do this of course), it'll take it OK but might creak a bit and if you're using a computer, the flex might mean one sensor clips the other slightly (if they're set close together).
That's about it, not too much to worry about, just get out there and all will become clear.
!
