Bridge, at the risk of being reptitive, I'll back up suggestions made previously to take some basic lessons in guitar and music theory. I picked up the guitar after playing trombone in the high school band, and was able to teach myself based on what I knew from my band experience.
Even if you're just going to play for your own enjoyment, it's worth it to spend a few hundred bucks on a decent guitar, rather than the cheapest one you can find. I have a Canadian-made acoustic by a company called Norman. It's beat to hell now and ready to be replaced, but I love it. It's just a basic acoustic, but it sounds terrific. Electric's fun too - I have a Yamaha electric that I play when I feel like making lots of noise. Feedback does wonders for stress!
I found the most incredible thing about learning guitar was getting good enough to play along with my favourite songs on CD. It's a real "eureka" moment when you realize how simple most rock and pop songs really are when you take away the glossy production and stuff. It blew my mind that I could learn a few simple chords and play all these well-known songs.
Someone mentioned trying a local music store for lessons - I'd go for that too, if all you want is the basics. I'd look for a folky-type shop. There's a place here in Ottawa called the Folklore Centre that does affordable lessons; I'm sure a look through the Yellow Pages would net you a place like it whereever you are (Toronto?).
I'll just add that as someone who loves music, I always encourage anyone considering taking up a musical instrument to go for it. You don't have to be an expert to have fun.