20A or 15A receptacle
15 amp duplex receptacles are fine for residential use. Unless of course you need a 20 amp device, on a 20 aps circuit, for a specific application.
15 amp duplex receptacles are code legal on 20 amp circuits (unless you're in Canada).
White to silver, black to gold. The grounds get twisted together, cut one wire off and the other goes into a green wire nut with the single wire to the green screw on the receptacle.
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.