Good luck! I just finished my first ever USCF event this past weekend and it was both very educational and a total blast.
You may want to ask, but we were provided everything needed, save chess clocks, which people either brought with them or purchased on site. A lot of people bought Chronos clocks and, unfortunately, tried to use them in the tournament without clue #1 how to set them properly. Know thy clock.
Wow, G/45 x 5 rounds. That's a pretty speedy time control (for me, anyway). Maybe some sparring games with friends or computers at that time control to get used to the pace...
I'm going to my first USCF tournament this year in October. I'm guessing that OTB, I'm between 1000-1100. My goal is to be around 1200-1300 by the time I play. To that end, I'm relearning all the basic tactics and strategy.
Here's the flyer from the tournament http://www.daytonabchcc.org/daytonabchcc/ClubChship2010.htm
I have until then to learn the basics of what the heck I'm doing. Specifically, I'd like to get some insider tips about what to expect and perhaps some recommendations about equipment.