As someone sitting on a mountain of Reaper Bones, this is great to know.
If you have stuff from the first three Kickstarters, or from that era, you'll definitely need to wash it and should probably prime it (test your spray primer first to see if it leaves the test figure sticky even after it dries). Anything after that, priming is mostly a matter of choice, especially after they started using the grey color for everything. (Most folks painting for tabletop quality or higher still prime them anyway, however.)
Recently, they've begun using
Siocast plastic resin for their new figures, and are transitioning the older ones over to it as well. It's a process that uses 3D printed masters, silicone molds and injection molding to combine the best aspects of traditional resin casting and injection molding.
I keep a pair of reading glasses in the car, in the bedroom, and living room. That way they're always within arms reach. lol I thought about magnification. My reading glasses are not that strong yet. I might invest in a pair for this reason though.
If you use glasses for reading already, I'd recommend picking up a pair of +3.75 or +4.00 lenses to use for painting. Even if you're just slapping a single coat of paint on them without highlights or shadows just to put them down on a table for your game, good clean lines are the basis of having good-looking minis and being able to see what you're doing makes painting good clean lines easier.
You might want to bring a mini to the store with you and try on a few different magnifications to figure out which is the best magnification for being able to see the mini as clearly as possible while still holding it at a distance that's going to be comfortable for you while painting it.
If you stick with the hobby, later on you should pick up a cheap magnivisor off of Amazon or somewhere.