Hello NightFall,
Welcome to the forums!
I guess some tactical tips would be to always know your surroundings, and stay in cover.
I think sleeping early means that you're not tired the next day. I almost fell asleep while waiting for a game once because I was so tired lol.
Oh yeah, always make sure your gun is adjusted before you start playing, so that your shots are accurate.
Stay low and most importantly, have fun! (and don't cheat ;])