Bought my first real gun, what should I get next?

Hey guys, today I ordered my first AEG, a CYMA AK74U: http://www.airsoftgi.com/product_info.php?products_id=3110

I also got a pack of 5 mid-caps and 3000 .25 bbs. Is there any gear or parts that I shoud look into getting to improve my experience (batteries, slings etc)?

Also, I'm now actually interested in possibly taking this this to actual game opposed to its original destiny as just a plinking/fun gun. What stuff would you guys recommend I get for field/ cqc gameplay?

Edit- also, is there a recommended set of face wear for people who wear goggles?