Okay, so I'm a 24-year-old (6'3 215 lbs) comic book writer/couch potato. I smoke almost as much as I drink - and I smoke a lot of f'n cigarettes. I don't really look like I'm out-of-shape (still have the six pack and all that), but I used to be a sprinter, and I know what it feels like to be in shape - and I'm not definately not in shape. I've got a lot of bad habits, (drinking, smoking, not eating right, etc.) and I've decided to try to change while I'm still young. Stopped drinking as much, and I'm gradually cutting down on my nicotine intake. It's a process, I guess.
Anyway, being that I'm an avid mma fan/long-time sherdog lurker (recent poster), I figure an 'mma-like' workout routine might be just the thing to keep me motivated/interested enough to keep at it.
A friend of mine does bjj, and has offered to let me roll with him, and I think it'd be a fun way to get in better shape. Still, I'd like to do more than just that. After reading over the posts in this forum, I figure it's as good a place as any to get a bit of advice. Aside from doing road work/jogging on a more regular basis, where do you guys think I should start, if I want to get myself in better physical condition?
Short term goals:
-Be able to run three miles again without feeling like I'm going to cough up a lung in the process.
-Don't care about looking like a bodybuilder, but I would like a bit more muscle definition.
-Increase my functional strength.
My workout schedule is relatively open, because I make ends meat doing freelance design, and dj'in at the odd bar when I'm not writing.
Any constructive feedback at all to this post will be welcome. I'm sure I'm not the only one that could use the help. Thanks in advance for you guy's time.
(Saw threads simillar this one in the forum, but I didn't want to hijack anyone else's post. Hopefully this thread won't have to be merged, moved, or deleted, but if it does, I won't spaz out or anything.

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Edit: The only real excercise equipment I have is a recumbent bike, and a rusty run-of-the-mill barbell with about 150 lbs worth of weights to put on it.