First of all, welcome back!
As far as glues go, I mostly use super glues and epoxies, with Tenax glue for styrene when I can find it. Tenax doesn't work with styrene to resin or resin to resin joints (neither will the Testors 'tube glues'), that's where the superglue comes in. For clear and photoetched parts, I use white glue (like Elmer's) or epoxy, since superglue can sometimes fog clear or photoecth parts.
Two-part body putty is the best to use for filler, it won't shrink like single part stuff, and doesn't take forever to dry like the old Testors contour putty does. I like to use the Bondo brand stuff- comes in a package with the big tube of putty and the smaller tube of hardener. Mix it in a 4 to one ratio (4parts filler to one part hardener), and you're good to go. And it works on any primed surface, be it plastic, resin, or metal.
Hope this helps, and again, welcome back!