hello mate.i have an old mk1 collar and box which does the job,but the new mk 3's are also good.
as for nets,i use either hemp nets or a heavy nylon net.you can get the thin 4 or 6 z nylon nets but they tend to tangle quite a bit and are rather fiddly on cold days
depending on the size of the warrens you are working and there where abouts it might also be advisable to think about getting a couple of long nets .
you will need a decent quality spade as digging rabbits out of setts will more than likely happen if the ferret decides to kill to ground or backs the rabits into a stop end ,also a