you can do 3 at the same time using a 3 seat mount. just stick with the team. if you want to help, then use a healing spec. don't bother with achievements or kills, for that use moonkins and lolfall.

if you don't want to go the ashran route, you can gear in the new zone, but gear is 695 tops there.

personally i go for the new zone, i don't really care for PVP and want to have some sense of progression rather than get a full set of max gear right away.