1.very social,don`t mind being handled.
2.let them get a bit of size about them incase of accidental jumping/falling etc,but handle them as soon as you can so they get used to it,I have a couple that were not handled and growen on and they are most unfriendly!
3.our cat ignores them but would not reccomend this sort of interaction?dogs could grab them quickly?no point to chance it?
4.Get one from a responsible breeder that won`t let it go till he knows its eating etc properly,6-8 weeks would be generally fine.
5.one is fine on its own and will be easier to provide the necessarries for,2 can lead to problems with dominance/unwanted mating etc etc.
6.I would go for a breeder that has bred before rather than a first timer that is out to make his fortune,you can also get old breeders that fall into that category.Petshops can be ok,theres always that other place but you want to get someone close to you so you can checkout their setup etc.