Wow, I was giving everyone else the chance to jump on this one ('cause I talk too much sometimes), but no one hit you back yet.
I would start with a chord book, or a beginners book (like Mel Bay, or something) that way you can get used to fingerings and posture, etc. You already know theory, I assume, so that's out of the way, you really just need to learn the chords themselves, then stick it all together using what you already know.
Concentrate on making clean chords (no buzzing, etc.), and go from there.
Once you get all your open chords down, move on to some moveable chords (barre chords), and then on to your blues scales (pentatonics).
It's best (at least it was for me) to concentrate on groups of chords at a time, like G C & D, for instance. Get those down, then add A & E, now you have three keys you can follow in by learning only 5 chords. You know which ones go together, so just go from that.
I would also suggest, if you're really serious about this, to get your own guitar. You will not be able to really progress by just playing a borrowed guitar at work. Go to
http://www.musiciansfriend.comand look through their specials and stuff. They have some really decent stuff for cheap. If you can afford it, and are going to stick with it, go ahead and get something in the $200 - $300 range. Otherwise, you'll just be buying another one within a year. You will "outgrow" a $99 guitar very quickly (unless it's used, of course). I would also check out your nearest Ibanez dealer and ask if they have any "Almost Perfects." It's a program that Ibanez does where they sell their scratch&dents for HALF PRICE!!!! My friend bought one, and we never have found the scratch! It was about $350 for a $600 acoustic--great deal.
I'll shutup now. Let us know if you need anything.
God Bless.
