Wargames factory plastics: Modelmaster cement. This stuff YouTube link put a drop of it on the part you want to join, brush that drop between the two pieces to be joined so it spreds well but pull apart for the solvent to get PLENTY of air so both plastics get tacky. after 5-10 seconds press the two parts together (GENTLY) and the mushy plastic will fill its own gaps and bond almost instantly.
Metals: Zap-a-Gap link all the way. It is fast, strong, and lower odor than some of the other superglues.
Both will require some tools to PREP the miniatures for assembly:
use a Needle file link all seams and joint parts. Glue works by bonding uneven surfaces, a file "roughs up" a surface while removing pits, pocks, or burs that make the surface TOO uneven.
A Dremmel (or in my case a black and decker RTX link lets you do pinning YouTube link drilling (for headswaps and making those wargame factory zombie "neck holes" a little deeper)) and the grinder so you can flatten the bottoms of those minis bases so they glue to fender washers better.
Last but not least I recommend using FENDER WASHERS link to mount the miniatures on (gives the plastics a nice weight near the BOTTOM of the figure) and putting ZD-1 magnets link in the little hole so you can store them on cookie trays link for easy storage. Using this method you can store the cookie sheet UPSIDE DOWN and the minis stay on! (Not that you WOULD, but still)
Paints, I like Applebarrel link for the blues, browns, and greens (Not thrilled with the yellows oranges or reds coverage) , reaper for my reds and flesh tones (and anything else really)
Really nice bit on the reaper paints is that the agitator (shaky bit that rattles) is a skull, so free bits if you finish the pot!
After you paint, wash/dip (I use minwax polyshades, have in the past used the army painter product) seal wit hkamar varnish, and if you don't like glossy minis, hit with testors dullcote