Well you would need a hutch and 2 ferrets if possible they like there company you would need locators and collars, food, nets, spare money for the vets and bedding.
You need to read up abit more before you get your ferrets and if you wait a few months you can get some kits
This site is pretty good http://www.all-about-ferrets.com/
Don't work em on rats people do it but you could end up with a dead or badly injured ferret just use a smoker. ;)
If your friend works his ferrets ask him can you tag along with him and then you will learn more. I know its the end of the season but somet