follow ur heart
Good news! Mankrik cluster [PvE East] is the free Xfer destination for PvE realms in Classic Era so ending up alone there is unlikely. I will point out that there is another, smaller, and likely often forgotten PvE West cluster:
I can’t offer an opnion on either since I play on the PvP East 1 cluster. No matter where/what faction you consider going, my advice for starting out is to first simply create a level 1 tester toon and try chatting with the locals. That will give you a feel for the culture each community has to offer.