Depends what you want. If you're searching for sheer numbers of players pvping, then big servers like Brandywine, Landroval, or (if you're European), Snowbourn. But all those bigger servers demand a price - there's serious lack of players that solo on these servers, also the lag can be a serious problem. So, as Squelcher said, R4 is still a low rank, making it easier for you to make new toons and try out said servers yourself. As for "help", you need to take into consideration that there is not THAT much that people can do to make it easier for you - do not expect invites to groups before you're at least R5. Best you can do, is read a guide or two, browse the forums for a bit, work consistently on PVE (so you get the map points) and save commendations vigorously for audacity. I have found out, tho, that nowadays, if you ask /ooc nicely for some common quest items, you WILL get them, because they drop like crazy and most of the time only clog the bags of higher ranks - so they want to get rid of them.
Last edited by Manvett; Sep 22 2013 at 10:45 AM.
Vilya: Healadder (defiler, R10), Kommisar (stalker, R7).
Snowbourn: Superserial (warleader, R8), Steelstack (reaver, R6).
Brandywine: Manvet (champion, R10 - Retired); Stargash-1 (reaver, R12)