Tank - 535 def
DPSers - at least 1000dps

Most gear on all your toons close to or above 187. Lots of Crafted gear helps. Crafted pvp gear fills in some slots till you get better pve gear.

Make sure you can do Utgarde Keep on normal with no issues and you understand all the fights especially the 1st boss.

Now do it in heroic. Farm badges from here daily till all your toons have their necks, trinkets and off hands (shields).

Then go do HGundrak and HCOT.