Good call, start with the ferret, it will all follow on from there. Got to point out though, if youre going for permission, you got to promise to be there one/twice a month at least with farmers, and make sure you are there too! I've spoken to quite a few who have people turn up all keen for about a month, then tail off and just turn up when they think there is more quary about. Very important to maintain your permission, or else you find someone else there who is a bit more reliable.