I seriously don't recommend being a sniper for Airsoft as a beginner. It isn't glamorous, and in the end, run and gunning is way more fun. Charging in with a sniper is a bad idea, and sitting back waiting is boring.
CYMA makes decent grade introductory weapons, I bought an AK that still competes well 2 years later, being fairly accurate, fast rate of fire, good distance, and the most reliable gun I've owned surprisingly.