I’m going to contradict a couple of folks’ advice, here.
One, don’t (necessarily) thin your paints. Consider thinning your paints, but it depends on what kind you get. If you’re buying high quality Reaper/Vallejo paints, then yes, you probably want to thin them. But play around with them first, to get a feel - thinner paints flow into cracks better, but can be harder to control for a novice. Plus they require multiple coats. So experiment. If you screw up a miniature, then soap, water, and a toothbrush will get you back to the bare metal or plastic for another try.
Second - don’t prime with black. Warhammer people do this. And it works for them. But for someone starting out, if you paint a miniature with black primer, you’ve basically just obscured all the details, making it harder for you to pick them out later. White primer results in brighter colors on the finished mini, plus you can actually see the tiny bumps and grooves. And once you do start using a wash (or thinned black paint works) over that white primer? It makes all those little details pop so you can easily spot what to paint.
Absolute basics for just starting to paint (to see if you enjoy it) :
X-Acto Knife
Pliers
Clean, stable work surface
Adhesive *
Paint **
Brushes ***
Varnish
Adhesive may not apply, some miniatures are in one piece. I think most of the Pathfinder line has, at the least, detached bases, though. You can usually twist the metal tab below the mini’s feet just a smidge (using pliers, into a faint ‘s’ shape) to make it fit snugly in the base without glue. If you have multiple parts to the actual miniature, though, you’ll need something to make them stick. If the parts are plastic (or at least one of them is) then Krazy Glue works. If it’s a bunch of metal pieces, then Krazy Glue can work, but I honestly just use epoxy.
On paint - good miniature paint seems pretty expensive. It’s worth the price, but I will tell you that I achieved pretty good results for years using ordinary acrylic craft paint. (Sold in Michael’s craft stores under the FolkArt brand, in little squeeze bottles.) It’s dirt cheap. You wouldn’t want to thin it, though. You will get better results with a miniature-specific paint line, but if cost is a factor, FolkArt’s good enough to get you started and let you practice.
White paint is a decent primer, though not the best. Again, it’d be something to let you get started more quickly and try things out.
For brushes, you’ll need two kinds. Cheapies, for drybrushing and priming (and varnish), and a slightly-less-cheapie with a small size and nice point for detail work. I don’t remember brush sizes well… I think I mainly use a 00.
Michael’s (and other craft stores) sell acrylic varnishes (Golden and Liquitex brands). I recommend that. There are different kinds - you want the regular viscosity (not medium - it’s a bit thick). There are also different finishes - matte and gloss, particularly.
Gloss is more durable, but makes things look ‘wet’.
So, here’s my process for miniatures, from beginning to end :
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Cleanup - Remove the miniature from any sprues, cut off any bits of metal sticking out. Check the fit of pieces, if there are multiple parts. File or cut to make them fit right. I also wash the miniature to remove any lingering traces of mold release agent that can interfere with paint adhesion.
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Assembly - Put the pieces together, using whatever adhesive is appropriate. If the parts are particularly heavy or awkward to hold in a good drying position, I will ‘pin’ them. (Drilling a small hole in each part with a hobby drill, gluing in a short length of wire.) Use putty, if necessary, to fill in gaps.
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Prime - I’ve used white paint thus far, but I’m about to switch to a mixed primer concoction I was recommended by a pro. After priming, apply a thin wash of something dark to call out the details.
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Paint - Well, yeah.
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Seal - Two coats of gloss varnish, then a coat of matte.
Oh! One more thing. Holding the miniature! I know someone else mentioned this as well. You need something the mini will not fall off of, no matter which way you turn it. I recommend a small container (one of those FolkArt paint bottles is perfect) that you can grip, with either double-sided tape or poster putty on the top. Either one can be used effectively to allow you to turn the miniature upside down for hard to reach details.