Want to make a pve character but what ?

So i have a Warlock that i toutght i would use for pve but as a dps its do damm hard to find a group that i get bored or pissed so i want to make a pve charatcer, tank or healer.

So i was wondering for PVE Tank Should i go Warior or Palatank ? I remember i used to have a palatank and when i ran out of mana there was no way i could keep an aggro if i had high dps with me. I have never played Warior tank.

For heal wich one do you guys think is the best ? I remeber palaheal is good because of the low mana cost but are shaman SO bad ? not sure about druid because i would like to make a dranei so any tips would be appreciated ! Thanks !

I would personally go warr or druid tank. All The healers are fine, shamans totems and BL is quite nice 🙄

First of all, you shouldn't have problems finding groups with this population even as dps (especially as a warlock). Just jump into /global and see what's available. You can keep rolling dungeons with practically no down time if you're willing to always go where you're currently needed.
On the other hand, it's a good thing that you're rolling a tank, since the server obviously needs them (just like retail servers did as well). Most people roll warri tanks, which is because they're very versatile and a lot of fun to play. The downside of rolling warri or druid is however that you will have a much harder time picking up all mobs from a larger pull, often resulting in the death of the healer. For that reason, groups for certain dungeons will specifically ask for a pala tank to avoid wipe-fests. While as a pala the mana can be a problem during very long boss fights, that will almost never happen in a dungeon, while in a raid you will most likely be an off-tank anyway, as main tank should always be warri or druid (make sure you have retri or holy off-spec, in case there's no need for off-tank).
As for healers, my experience is that paladins usually have a tough time in most situations, due to their lack of AoE/group healing spells, while priests are usually the first ones to die due to lack of aggro on mobs from tank's part. Shamans are excellent healers and by far the most desirable class (regardless of spec) to have in any group.