First, congrats on entering your first tournament! No matter how you do, I'm sure it will be quite an experience.
Regarding equipment: for a tournament, you'll want a set with fairly large pieces (king height around 4") and a board to match (squares around 2" to 2 1/4' per side). Fortuantely, you have a lot of choice. Pretty much anything from Wholesale Chess ( http://www.wholesalechess.com/shop/chess_sets/tournament_chess_set_combos ) will do, though of course you can shop wherever you want. I personally prefer the "mousepad" type boards to vinyl, but it's a matter of taste.
Clock choice is a more complicated topic. You'll want a digital clock because of its ability to handle move-delay times. In USCF tournament play, you may be asked to set your clock for a 5-second delay per move, something that helps prevent time scrambles near the end. For this reason, analog clocks are becoming very rare at OTB tournaments (but they are still permitted). Again, Wholesale Chess has a good selection ( http://www.wholesalechess.com/shop/chess_clocks/digital_chess_clocks ).
I don't know how much money you have to spend, but at the lower end the Saitek clock seems to work OK. You may also be tempted to buy the Excalibur clock (not in stock at Wholesale Chess, but available all over the place)--while it works fine and can be reasonably priced I'm not a big fan because it makes a lot of noise when you hit the plunger. If you have some money to spend, go right for the Chronos. People will tell you that it's impossible to program, but those people are wrong. Read the manual, play with it for a bit, and it makes complete sense. There is a tiny folding clock from DGT that's fairly cheap; I played with one this past week and it kept falling off the table.
As far as books are concerned, I wouldn't worry so much about that. If your opening repertoire is in fairly good shape, don't try to add anything new right now. Some endgame study might be worthwhile, but don't go crazy. If you haven't done a lot of work with R+P vs R endgames, now might be the time to learn the Lucena and Philidor positions. Most of all, I'd recommend doing tactics work, either here on the Tactics Trainer or over at Chess Tactics Server or Chess Tempo.
Whatever you do, enjoy yourself!
I am going to be competing in my first tournament soon. I will need to bring my own chess set and clock but I don't own either. What chess sets and clocks would you recommend for tournament play?
What books would you recommend to study before your first tournament? I would like to focus on strategy and endgames.