Since it's your first AR.. heres something to do right off the bat.

Dont be afraid to do this... it's important.
Get on youtube and learn how to take it all apart and put it all back together again... do it a few times. Next, lay all the parts down on the table and take some q-tips and get all the orangey type packing grease off of everything... all the parts, all the inside of the upper reciever, etc.
Next, Put a good coat of oil on all the parts and let it sit for a while so it will disolve the rest of the left over grease. Finnally, slam it all back together and cycle the action a few times, you will notice a considerable difference.
Just make sure the bottom/forward of the bolt carrier and bolt face are clean and dry. The bottom of the bolt carrier strips the new round off the mag, if it's oiled up it will jam. Make sure the bolt face is dry because the bolt face has the extractor, which need to be free from oil so it will latch on tightly to the back of the shell when it rips back and pulls it out of the chamber.
Cautions: 1: When you pop the rear take down pin, carefull not to let the barrell flop down forward as you can damage the front take down pin.
2: You never have to use tools to pop or re-seat the take down pins, keep them oiled and they should work fine.
3: Keep the chamber/barrell lightly oiled "when not in use", but make sure the chamber/barrell is clean and free of oil when your ready to shoot.
I'm sure others will have some more advice, but this will get you started. Enjoy bro, i can't wait until myne arrives.
Cheers.