You need ;
2 gang outlet box - best to use weatherproof
1 wall switch
1 reg wall GFI outlet
heavy duty outdoor extension cord/ cut the female end off
1 screw in wire clamp to keep the cord from pulling out.
Pretty simple wiring job, look online for a diagram if you are unsure about the wiring.
You can also find a GFI power strip with switch. If you are only controlling one pump then this
would save you a lot of work and cost almost the same.