Thiokol,
Welcome to the fun, a lot of great information here. Once you pick up your new weapon you will have a blast with it.
I too am new to the board, had my M&P 15-22 almost a month. Like several folks have written you will need to find out what works best for you.
I have already used the following for several hundren rounds and have had no issues.
CCI Mini Mags (100) about 500 total
Federal Champion (50) several hundrend total
Federal Bulk (525)
Blazer Bulk (525)
I have a box of Winchester X-22 that is next followed by CCI Tactical is my last sample.
So far I have had no issues, but you need to try your weapon and see what it likes best. as others suggested try several hundrend rounds and see how they feed, eject, accuracy and what residue do they leave behind.
As the documentation reads and others have posted stay away from Remington. It does not want to play well with the 15-22.
Good luck and enjoy the time at the range with the new toy.