There is tons of good information on endurance training.
Check out training and diet for marathons and triathlons.
Build some variety into your training... hiking with hills.
even golf without a cart would be good for rest days.

Have some intermediate goals... Total miles per month, weight lost per month, Time to do 10 miles.
Mapping your progress on those goals will help to keep you motivated.

Read inspirational books...

report back here periodically.

Good luck, and go for it.