Good for you, Eric! I would start off slowly, but work consistently. Do you belong to a gym? If so, you might consider getting a session with a trainer. You don't have to buy into some multiple sessions package plan, just one will suffice for starters. Then as you see improvements, you could get another session to take you to the next level. Or, while at the gym, look what the really fit guys are doing and follow suit. You might pick up a copy of an exercise magazine. I like
Men's Health. You can usually get a variety of exercises for a variety of body parts from one issue. You could also browse the WEB for these as well.
If you don't belong to a gym, get outside and enjoy the fine weather. Any sort of outdoor activity will get the heart pumping: go for a walk, a light jog, a bike ride, a swim. Do you enjoy sports? Get involved in a softball league, or as fall approaches, a touch football league.
Do you have a friend or work colleague, who you could join you in exercising? A workout partner will give you added incentive (read kick in the butt

) that we all sometimes need.
Any exercise regimen should also include the right diet. Eat sensibly and you are more likely to have the energy to exercise. But also plan cheat meals (I like blueberry muffins, but keep them for Sunday mornings).
The author of a blogspot posted 101 Tips for starting and staying with an exercise program. Two of the best were placing your alarm clock away from your bed and putting exercise clothes next to it. Once you're up, get out there. I can't find the link, but am happy to send you his tips via pm, if you wish.
Just remember...Discipline and Patience! Before long you'll be back to your old self!
Good Luck! Keep us posted!
Best,
BBC