Figure out rough estimates of top speed and range for your build.
a forum filled with builders. this place is literally overflowing with good information and community support. Started by Jason Potter of Enertion Boards. I'm also a moderator there.
an excellent way to compare damned near every model of electric skateboard available for purchase from anywhere. Complete with specs, links to vendors, the works.
A great post on esk8.today about range and how to calculate it. Definitely worth the read.
a place to look at a lot of skate porn as well as share your builds and specs