I'm looking to unlock Selene Jean for her armour mods. So I need to get mining.
[...]
What should I be looking for when kitting her out for mining?
You need to refine a lot and probably don't want to spend too much time with it. So the most important thing is refining speed.
You do
not need the largest refinery. That's just convenience. 3 bins are actually enough to simply match them to the asteroid you are currently mining.
In fact, larger refineries provide less bins than cargo racks of the same size offer slots and they don't make you any faster either.
Get a class 1 prospector. A grade will provide the most fragments per asteroid. You will most likely encounter the 10 tons of Painite among 500, but in case you don't - you can fit a larger one later to actually use it for finding asteroids as well (allows you to fire multiple prospectors = faster prospecting rate).
Medium mining lasers are the fastest fragment generators.
Your current distributor can sustain 2 of them, but you can add a 3rd and let the capacitor drain.
Unless you have a better distributor around you can stick to it, since it's already slightly better than an 8A.
Collectors can be D grade since fragments are generated within 500 m (laser range).
You'll want at least 3 active per sustained medium laser (or one per WEP MW). Preferably a little more so you don't have to position yourself perfectly.
Also, somewhat related, where's best for mining Painite and gold?
You'll need a metallic
ring with high reserves (belts don't contain Painite).