The DRZ-e should have come with a fixed beam headlight and a LED tail light as std. I would sugest getting hold of a clymer Manual (like haynes but a lot better) as these have excellent wiring diagrams. If you want dipping headlights etc use switch gear from a DRZ-s. It should all be pretty straight forward.
As for initial testing I dont think its very difficult.
A think the DRZ will fit into the exempt from MSVA under the Enduro clasification.
check out this link
http://www.dvtani.gov.uk/vehicletesting/msvafaqs.asp#15If your in the east mids area I may be able to assist as I wired up my DRZ for road use