You will need to provide a bit more information than that!
About you:
Age, size, weight, how much assistance is needed, whether you can provide much power via the pedals.
About the riding you plan to do:
Distance, steepest hills, longest hills, tarmac or off road, how much baggage needs to be carried.
Practicalities:
Where will it be stored, where will the battery be charged (on or off the bike, indoors or outdoors), does it need to fold.
Have you seen a style or model you like?
More detail, better help.