I highly recommend Airsoft Gear for your gear and accessory needs. Lipo battery + lipo smart charger can be had for about $50-60 from them. Batteries and chargers are on order at the moment and I was told by the staff there they'll arrive within the next 4 days or so depending on customs checking and releasing their shipment.
Gun you'll spend ~$350 for a full metal barebones King Arms M4 or if you want something a bit more you could go VFC but best price for performance for a starter is the King Arms.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE