Everyone here will tell you to get an AEG first, and it's a good idea and usually more fun. I'm going to say this now, if you think sniping is about shooting people all the time, then you have been misinformed, it's mostly about recon and relaying information to your commander or team. If you aren't willing to devote yourself to that mission then you shouldn't be a sniper.
.....Amen. Don't forget that some stock AEGs can have the same accuracy as a sniper too :p
Anyways, if you wanna be a sniper, this is what I recommend. For gear, get a ghillie suit, don't try making one. The best places to hide and conceal your shape are laying down behind the base of tree-trunks, rocks, stumps, and little knolls. Use a boonie hat if you don't have a ghillie, they will help shade the area around the scope and hide your head shape a little bit more. Also, if you're using facepaint, start with a layer of green all over your face. Then, cover the shiney spots with black (cheeckbones, nose, forhead, chin). Then, cover the darker areas with a lighter color, such as tan (under your nose, under your eyes, under lower lip, under chin). Want anymore info you can PM me, although I hear Ghost is extremely good with that.