18/12/0: Standard (versus tanks)
For masteries, I recommend the given 18/12/0 page, using Fervor of Battle. I prefer this page due to the 7% armor penetration (needed in the top lane, versus tanks), alongside the bonus damage of Fervor.

12/18/0: Poke (versus squishies)
Against a more squishy top-laner (not as tanky), the given 12/18/0 page using Precision and Thunderlord's Decree is nice; Precision gives some armor penetration, while Thunderlord's Decree helps immensely with poke.

Teleport
Teleport is a standard top lane spell. Used to get to lane quicker, split-pushing, roaming and more. Recommended for Caitlyn to miss out on as little farm as possible (especially versus lane bullies), and to split-push late game.

Flash
A common recommended spell. Helpful for engaging, disengaging, chasing and kiting; recommended overall, always take.

Ghost
Helpful for chase and kite with the additional speed boost. Take only if you know you can out-sustain your opponent and/or win lane (else you will lack Teleport's utility) and want some extra kite and chase potential.

Heal
Similar usage to Ghost, gives a small speed boost alongside a heal to help with kiting and some chase. Again, take only if you can out-sustain or win lane, and want the kite and chase for plays.

Avoid playing this in ranked, unless you're in a group of friends or people who are okay with it - or be prepared to be flamed. You could argue that Box Box did it, however ...