bought a guitar

[cmdrost]

yes, switch to lower strings if on acoustic. The real difference in the thicker strings is how much louder your acoustic will sound. Start with the lighter strings.

Like Shad said, just gotta stick with it for a couple weeks till your fingers get used to it. Then it doesn't hurt.

Learn the chords and then try to play along with some songs you like. Thats the best way to get your rythym down.