Ok , I need help

I have an e model and am looking to rather get a motard wheelset and swop wheels instead of buying yet another bike.
I am happy to stick to e model gearing , and for my type of riding I am even happy to stick to e suspension as well as the smaller front brake disk.
The question is , what am I looking for in bumtree and junkmail

Surely the motard wheels are not a one size fits all type of deal ?