I assume that it is 2" NPT threads, Yes? I would get 2" PVC couplers with 2" or 1.5" schedule 40 PVC pipe and start threading it together, that is for the outlet. Are you running the pump/motor outside or is it in the basement with the discharge hose going out a window?
I have an electric 1/2 HP pump in my crawl space to pump water out. Outside I have a 1HP gas powered pump to move water over the driveway into a drainage pipe. (lots of rain for me too)