i would look and try to find some used traps that are in OK condition. maybe in the news paper or garage sale... becasue u can get them cheap. those new traps are very expensive. maybe try getting to the NTA conventions or your state conventions and buy used traps there. you can get used traps for very cheap and people there could help you with what you need beyond traps. i would get 1 1/2s coil springs to start. they are good for just about everything that i trap . coon,mink,muskrats and they will hold a fox. if you cant get any used traps the cheapest trap is Duke. they arent a bad trap even tho people say the are.
lures- i wouldnt go way over board on lures. for muskrats you dont need anything. u can use just an apple for them . for coons and possums you dont really need lure. u can just use sardines,jack mackeral, anything fishy or sweet. like honey and vanilla. but it wouldnt hurt to get some lures. some good lures for coons would be fish oil- its cheap and works well. also red fox gland lures work great for coons and so does red fox urine. for mink you can use fish. and a lure. i dont know much about mink. lol
fleshing and stretching- maybe get some muskrat strethchers if your going to trap them, there isnt much fat on them and you dont need a bunch of tools for them, all i use is a butter knife and scrap all the fat off with that. i still sell my coons green becasue i dont have enought money to buy everything. it would cost around 150 to get started fleshing. if your fur buyer buys green furs he usually takes off about 2-3 bucks.
hope that helps some...