I am used to playing 6-max online where pots are often heads up , 3 way or won by a single raise preflop.
The standard raise is also 3x.

Pretty new to live, I find there is much more multiway pots, much less fold equity and a hell of a lot of limping.

I quickly realised playing as aggressive live as you do online (20/15 Vpip/pfr) is just spewing chips. Probably something like 20/8 or so is generally better.

My question however is:

When facing a limp/several limpers, what are your limping hands. (I can't bring myself to open-limp)

I've been mainly folding unless I'm on the blinds or late position, and playing suited connectors/Broadway/22-TT hands. (Not many 1 gappers like 97)
My reasoning is that they're way too hard to play post flop with 6 runners and if you hit, you're often out kicked.

Also, what are good hands to raise these limpers with. I've been only doing it with AQ, AK and JJ+

Any other adjustments from online to live that may help?

Good questions, OP, but there are a lot of threads asking them already. Please read the "best of" threads and use the search function, and then come back with any specific questions you feel haven't been adequately discussed.