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I like to use Sculpty III. 20180827_072326.jpg Some people think its to soft but it works fine for Pop! As far as paint goes, I use regular acrylic paint that you can find at hobby lobby or Walmart. On my first couple I use white sculpty then painted the figures, but now i find it easier to get the sculpty in the color i need rather than painting it. Also pick up some sculpting tool. 20180827_072503.jpg These are fairly cheap at hobby lobby & with finer details.
Oh yeah. A good way to get the heads off is to submerge the head in boiling water a little past the neck. After a minute or two the glue should start to releases. Super glue works best to put them back on.
I hope this helps!

It sure does help! Thanks for the reply and info. I actually just ordered a few figures to start with and posted about it, giving a nod to your post here as an inspirational push. I appreciate it!