500 rounds of FMJ (WWB at walmart is the cheapest and most reliable)
2 boxes of Federal HydraShock Personal Protection (Shoot one box to make sure they feed)
A good place to shoot (we have a range close to here that does monthly memberships for $50 that way after the 3rd trip I am saving money)
Now go shoot...alot!
Also, you can try different JHP's, but the Federals are a great place to start until you find what you like best.
Dont buy alot of accessories or have a lot of work done to a brand new gun. After 500 rounds you will know better what you will want to do to it. I also wouldnt buy a lot of extra mags until you find out if you like the short or long mags better. Also you will get used to loading and unloading the mags you have, also, if on the off chance you dont like the gun, you will loose almost all you paid for the mags.
As far as a holster, I assume that you dont have your carry permit, so you probably have a couple of months before that comes in, so you can take your time and find a good holster that will serve what you want.
Oh yeah, most important, Have fun!