1) I think a tank.. you can always roll a healer later if need be
2)A Kinship is the equivalent to a guild and as far as I know you do not get any bonuses other then your kin mates helping you out
3)I guess the Rune-Keeper would be considered the advanced healing class. They mainly do over time heals and insane damage but you can only do one at a time so you can specialize in healing.
N.B.: The proposed class changes, on the 18th of November when Helms Deep comes out, could of course change the ability to tank/heal/dps on any character.
Amikion, Lore-Master on Evernight and Officer of Not So Serious