Hello Eilik! I feel Xenedra covered most of it, so I'll try not to repeat too much.
Balmung does have a large RP community, and it is not hard to find random RP. Some places in game are easier to find it in than others, but you won't have to look very hard.
As for PVE and PVP, PVE is thriving as much as it is on any other server. Many RPers are very active in end game content, so you should be able to do PVE to your hearts content. PVP isn't hard to find either. While it has flaws, you will be put into matches with people from other servers as well, so the PVP population on one server isn't much of an issue.
I hope that helps!
Balmung does have a large RP community, and it is not hard to find random RP. Some places in game are easier to find it in than others, but you won't have to look very hard.
As for PVE and PVP, PVE is thriving as much as it is on any other server. Many RPers are very active in end game content, so you should be able to do PVE to your hearts content. PVP isn't hard to find either. While it has flaws, you will be put into matches with people from other servers as well, so the PVP population on one server isn't much of an issue.
I hope that helps!