I have a player who is using a homebrew flying race to add to his heal/buff cleric's survivability. He's promising not to use it too much to his advantage, especially because none of us have any experience with 3d combat (that 3rd dimension doesn't bother us, just the mechanics for using it), but I still feel that I should be knowledeable on the subject just in case he wants to do something a little out of the ordinary. I found some pretty good reference materials for the movement options, but I'm kinda thin on the actual combat mechanics.
So, my question is, where can I find rules for things like fly-by attacks, attacking while hovering (melee, ranged, and spells), how ranged attacks are affected by altitude, and other relatively simple (or advanced) aerial combat tactics.
We don't have many physical books, but we're ok with using pdfs as a fill-in until we can get the appropriate ones.