Re: Things to know before learning the guitar?
I haven't had too many bad experiences with guitarist over the years. Two things I'd highlight once you are up and running, are:
1) LISTEN to what everyone else is playing....some guitarists have a tendancy to noodle away in their own little world, oblivious to what the rhythm section are doing. Makes for a very messy sounding band, I think.
2) Work on your timing....if I have one gripe about guitarists, it's their ability to push or pull a song in all directions. Hopefully your drumming skills come into play here and you develop a good feel for time early on.
That said, you're a ways from playing with anyone yet mate....just enjoy the learning process and have fun with the instrument.