My first tri this Sunday!!!

Good luck!!! When you cross that finish line and able to call yourself a triathlete will be a special moment. 

As for the flats, you can only do so much to prevention yourself. Yes, they just happen, but before the race check your tires, first look at wheel closely, with your eyes to see if anything is stuck in your tire, then wear a cotton glove or put your hand in a sock. and slowly turn the wheel, if there is anything stuck in your wheel, the cotton will get snagged, then carefully use a pair of tweezers to remove the item.

Cant wait to read the race report.

First sprint...hmm:

-Bring duck tape and put it in your bag. I and a couple of my rack mates needed it before the race and it was good to have.  Bring a couple of extra safety pins too.
-Spend a couple bucks and get a race belt.
-Don't bother wearing socks for a sprint.  I had some chaffe and bled a little in my first one, but I forgot to put body glide on my achilles.  For a short run though, it isn't worth messing around with socks in T1 IMO.
-Apply body glide where needed, which is all over the place.
-Have transition nice and simple.  No need to overcomplicate it.
-Search on this site because there is a couple of good threads on this topic with alot of tips.
-Get there early and get a spot close to the T1 exit.
-Don't worry about getting a flat.  If you do, the race is over for you in a sprint so you can just take your time after that.

Those are the first few that came to mind.

That is GREAT!! I have my first one next weekend and I’m already nervous. \

I didn’t even thing about a flat, so thank you and good luck!!

Have fun! 

Checklists help, as long as you remember to grab the bag with all of the gear
Get there early in case something doesn't go quite as planned
Relax (before the swim and during the swim especially, but the whole day is supposed to be fun). 
Have a race strategy that works for you, and don't worry about the other 30, 300, or 3000 other athletes racing their races. 

Thank the volunteers, officials, and spectators.
Encourage other participants.
Smile for the pics. 

As for a flat tire, if you haven't practiced changing a tire, don't try it tonight, but look online at how you would fix it if it happens.  Don't overinflate your tires hoping for that last little bit of speed, and pay attention to where you ride to hopefully avoid things that cause flats (glass, sharp rocks, potholes, etc. )  Later, if you're still concerned about flats, get some bombproof or nearly indestructible tires (Continental Gatorskins, Bontrager Hardcases). 

I was also concerned about a flat before my first race. But, as you did, I came to this site for some insight. I read something to the effect of "The odds are well in favor of NOT getting a flat during the race" That little pearl set my mind at ease. (thanks to whoever originally posted that)

Good Luck. and Have A Blast!

Lou

Good luck man,.,
      I hope to read your report soon!