One of Geek and Sundry’s featured vloggers, Sachie, runs an excellent series that helps out both new and seasoned cosplayers. She features great cosplays constructions of her own and step-by-step guides for creating things like armor, weapons, etc.
For example, here’s her most recent video, a Worbla (a thin plastic-like material) armor tutorial:
What I like about Sachie’s videos is that they are short, concise and cover a whole host of subjects pertaining to cosplaying. Her vlog provides great advice on working in the cosplay community as well as how to make very cool stuff. I really recommend you check out her content if you are even remotely interested in cosplay!
Here’s one of my favorite videos: