Certainly no veteran class-taker but I would suggest you zero at what you want your zero to be according to your application, just know your offsets. If its self defense in your home it might be 25, I'm a hunter at 100. I don't think we spent a lot of time at 100 yards. That could change with a dedicated carbine class.
Similarly, wear what your application/desire to train dictates. You can play in full battle rattle or casual wear or police uniform. IIRC most last year were in a battle belt or chest rig but just jeans and a belts fine. You'll want access to 3 rifle mags at all times and 2 pistol mags, so this dictates you wear a good belt. Probably also specifies no serpa holsters unless department issued.
He does a great job of letting you be you, until you're wrong, and then you're better.
Good deal! Thanks for the information!