If you're a relative new PVPer, Arathi Basin
can be very intimidating. It has more players than Warsong Gulch, it is considerably bigger, and the objectives aren't
nearly as clear.
This comprehensive article over at OGaming is for you.
Even if you are an experienced player, it is likely that you will find something in this article that you can sink your teeth into. As a moderately dedicated PVPer, I've never pulled off a 5-cap and I found their advice very helpful. I'll try for the 5-cap tonight and let y'all know how it works out. :D