You bought good high end enthusiast mobo it can handle pretty much everything from these days,
Yes it supports Corsair AF120, since all the fans connection cable is the same 3 or 4 pin standard, af120 isn't different.
You can connect like five of them I believe, based on how many connection pins do you have on ur mobo, just make sure they'll fit into your case
What about LED strip I'm not sure about Akasa Vegas but usually all of them are connecting to some molex so in that case you'll need one molex cable from your psu