I stay away from lube that has teflon.
Everybody and their red headed step-brother has a break in procedure.
Is this going to be a blaster or do you want some amount of accuracy? Cruise the Net and find a barrel breakin procedure that agrees with you.
It may or may not make a difference (depends on who you ask). It won't hurt, and its agood way to pace yourself through the sight-in phase.
Mag capacity does not matter at the range, unless unless there is a race for most rounds wasted. If you hit center of mass with 1 shot smoothly and with speed, (head is better) instead of 1 "I hit it....!!!" out of 5. Well that's what it's all about...
Shoot different positions, single/double tap, change distance (after zero), multi targets. Do what you need to be comfortable shooting (and hitting with) your weapon at a distance you can hit every time, from 15 yds to your max (100, 200 whatever).
H*** Crap, Sorry for the soap box tour. This kinda got away from me. I'm on the back deck and the birds are singing, Pass the Ammunition!!