Based on what you put I'm going to assume you me HM primals so tips to keep in mind
Ifrit: you stun eruptions tho he gets stun res every 3-4 stuns and will be immune for 3-4 so I usually if I get Ifrit for roulette stun in the beginning for 2 sets then don't stun again till after hell fire when the eruptions actually hurt mainly the one just before the full arena plume so ppl make it to stack. As long as other players don't stun you can keep it for when you need.
Garuda: just adds nothing hard
Titan put on dps accessory and play a dps unless the mt sucks or heals do you will have no issues.
Mog: mt on king and it grabs both adds in Hm that isn't a issue they don't hit hard enough to not tank them both
Levi HM: it gets tail and stun locks the wave tooth( or waves spine bad with names the caster add)
Ramuh Hm: same as Titan you just dps and help with mechanics.

When you get to EX and coil it's a completely diff game you will have more to do somewhat.