Just get on the bike and ride consistantly.
Train for endurance, i.e. 60-70% of your max heart rate.
Just put dextrose in your water bottle if you ride for longer than 1.5 hours.
If you keep your heart rate low, i.e. 60-70%, you won´t have to worry too much about cortisol, hence the dextrose in your water bottle.
IF you start making it real hard on the legs, you´ll start eating muscle.
Watch out for hurricanes.