Re: first build,tools needed?
Keep in mind that your bicycle, now a motorbike, will also require more maintenance.
I recommend a good assortment of bicycle maintenance tools like hub wrenches, headset and bottem bracket tools in addition to the regular assortment of mechanics tools including but not limited to socket set, metric wrench set, adj. wrenches, screwdrivers, pliers, snips, allens etc. The more the better. You'll need them all at some point.
As far as getting started or if your checking your inv. to make sure you already have it, the above is all good advice!