Run an accessable drain on the bottom of the tank. Best to use a good on/off ball valve. Or a bit more expensive, as on my system. A valve that opens automatically any time pressure gets below 10 lbs. ( from a semi-truck).
You will have an outlet on the side of the tank for pressure air. Run an air/water seperator and regulator from this outlet. For a direct hose connection.
If you hard plumb lines. Make sure all lines drain back to compressor. Put a regulator/filter at each outlet.
Wiring electricity depends on local codes. Here at home, I use no.10 Romex and a 20 amp 220 breaker in the box.