Clean it, and clean it well. There will be metal particles from the milling processes left in the action, chamber, and barrel. Get all that **** out of there along with the factory rust prohibitive gunk. Once that is done lube everything up and put a few rounds down range. Then clean the barrel again and put a few more rounds down range.
There should have been cleaning/lube instructions with the rifle. Read them. There are a lot of good cleaning/lubing YouTube videos. There are also a lot of break in vids and opinions on barrel break in requirements available on various AR forums.
Enjoy your new friend, and keep your credit card handy.