Nostalrius Begins - Quality wow vanilla realm (1.12)

I've got a bit of a confusion going on with my realmlist some advice would be much appreciated, i installed the game and logged in without changing the realmlist i left it the way it was when the game was installed.

Now i got this trip that i didn't log onto the right server because i didn't change any realmlist before launching the game, i am looking for the most populated server to start playing on i logged onto 'nostalrius begins pvp ' is that the main server? There was also a bunch of test realms and a pve server i chose the pvp and it shows up as 'normal' population i was abit concerned about my approach to the game and didn't wana waste time levelling a character on the wrong server. Some advice would be useful cheers.

log in, type /who if it's above 2.5k, you're on the correct server

and yes Nostalrius Begins PvP is correct

If you downloaded the client from here, you are using the correct realm list. Nothing else you need to do but chose which server you want to play on, PvP or PvE. Both realms always show normal pop. You're over thinking.....