We really need more information.
What kinda .223 brass are you gonna get? Is it milsup and boxer primed? If so it has a rim pressed in around the primer that has to be removed before it can be reloaded but it's a one time affair and they make a little tool that makes short work of it.
I've reloaded a bunch of it.
If it's commercial brass, reloading it will be as straight forward as any other cartridge.
One thing, the twist of the barrel of the AR you're getting will have a lot to do with which bullets you will need to reload to get the best from it.