1. Everyone has their own preference. Personally, I use Medium CA for just about everything. The only major exceptions are that I use Epoxy for joining the two wing halves, and thin CA for CA hinges. Please read this: [link=http://www.rcuniverse.com/magazine/article_display.cfm?article_id=55]Installing CA Hinges[/link]

2. It depends on the type of glue. With wood glue, epoxy, Medium and thick CA you would put the glue on the wood first, then add the next piece. With thin CA, you put the two pieces together and add glue.

3. Lay Waxed paper under whatever you're glueing