Best advice I can give besides what everyone else says (spend the extra on good eyepro and a good gun, and try someone else's before you buy to know you like it and it fits with your body/play style) is thus;
Do NOT skimp on footwear. You're on your feet all day, walking and running and climbing. Your feet are going to get wet. You're going to trip and slip and fall. Get good boots that are waterproof and give good ankle support.
KJW SIG P226R -- WE 1911 Punisher -- KSC USP Tactical -- KWA USP Compact
KWA MP7A1 -- WE M4A1 -- WE KAC PDW -- WE G39K