Two things is all...
1. You don't need the cooler with the locked cpu but if you want it then it's up to you
2. Case fans... So many case fans... Are you building a PC or a hovercraft? 😉 seriously though, just get a couple of fans and then if you think you need more, buy more but I think you'll be fine with a couple, in fact, doesn't the case ship with fans already?