hi mate,
1, its best to keep two or more ferrets, Id say approx 2 legs of chicken sort of amount, some people keep a dry ferret mix down all the time, but feed meat (rabbit) daily, if you can work it out, I have 9 ferts and they get a whole rabbit daily between them all, minus the head and rear legs
2,attention wise; you get out, what you put in, meaning if you want to spend half hour each day with them, fine, but dont expect to have a great ferret, ferrets are like all domestic animals, the more you handle them, the better they get, they dont bite, they will be easyier to work etc