You can see server pop at realm list.

Just look for the <HIGH> pop servers on the server list. I'm not familiar with the Europe servers. You don't want the very highest pop because you do have to consider queue times during peak hours. Any ol' high pop server will do and then start your search for good players. It won't be easy.

 

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Wait till expansion hits. There may be new servers.

And trust me, if there is, you'll have a blast playing there as opposed to an established server.

 

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If you insist on playing now, and need some financial help...

Kul Tiras(Horde or Alliance)
Bleeding Hollow(Horde)
Zul'jin(Alliance)

if you were to roll on one of those servers, I could give you some cash to start out.

 

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Is the continent change already in game or it will happen with the expansion?

It's already happened. The Shattering, that is. The changes are all in effect.

The only stuff you don't have access to right now is the 2 new races, and the 80+ content etc.

There's probably more, but that's the general stuff.

 

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What RP / RPPVP servers are best?