well first and for most welcome to the section, you are rigt when you say that ferrets are amazing, i am only 15 and have 7 of them..
ferrets are natural workers and hunters its there instinct, the only way you "train " them as such is to use them as much as possible, obviously some will bolt more rabbits than others, (bolt means to scare them and make them run)
before you go you will need to buy some nets, hemp is best.
then you have to peg up the nets, thisis simply tying a peg to the 2 draw cords.
when geting to a warren (a set of rabbit holes) you put the peg at the top of the hole, a