An easy first trick is to use the search engine of this Forum (it's in the top bar just under the login box). This Knowledge Base forum has quite a few posts and threads about bondage: try searching for rope bondage, gags and the like and you'll find some. The A-Z of BDSM thread (sticker on top iof Knowledge Base) has two vital threads, B is for Bondage and J is for Japanese bondage.

I started off a thread myself about self-bondage, 'cause I know a faii amount about that, opening it with a manual of how to get a good self-hogtie. Planning to continue the thread soon with more fresh matter. btw I know one or two other good self-bondage sites as well.