I was wondering if there were already any rules in place for a player buying the services of an NPC, what's a fair price, how much food and such do they need, that sort of thing, and if not what would you consider fair? For context, as I mentioned in another thread my character intends to go around defeating slaver groups and transporting the slaves home, and I figure I'll recruit quite a few slaves here and there to as my gang or crew or whatever you want to call it, then train them to do various stuff I need. So I need to know things like if 20 credits or so a week is enough pay, how much a weekly supply of food for the players would feed them, whether there are rules in place for training NPCs and even other players I could use, and anything else I might have to deal with that the community can think of.

Let's go with bare minimums, a field ration pack is good for one meal and costs 5 credits, so assume that 3 square meals costs 15 credits a day. Now field ration Packs might be a little expensive and even mildly tasty. If you're just trying to survive then field rations seem likely to taste significantly worse, but they do provide enough nutrition for a week for 10 credits. More expensive and luxurious consumables like Corellian Whiskey and Ryshcate are in the 10-25 credit range.

So for costs for food per week lets say 10 credits for survival rations, 105 credits for livable meals, double that at 210 credits for reasonably good food, and 525 credits and up for eating really well, and even more if you are really dining on luxuries. Personally I'd just round out the numbers and say 10/100/200/500+ credits for weekly food expenses. Depending on what you spend and the conditions of your workers you might get some setback and boost dice in your interaction with them.

That's all just for basic food costs, as for pay it probably depends on what they are doing for their job. But food costs should give you a pretty good idea of what wages might be, if they had to pay for their own food and other living expenses figure out how much that might cost and work from there.

Special Modifications gives monthly wages for maintenance techs, ranging from 1000 to 2000 credits, and some additional options for specific work. Might be a good place to start from.