I just realized theres actually a crapload of people in this game but the vast majority do PvP exclusively in warfront zones.
While there are many who PvP it might also depend on your server. Although with the latest patch it's easy to get to another server (not that it was hard at all for a while).
Here is a guide for when you get to level 60. there is quite a lot of content you can do.
http://www.mmo-champion.com/threads/1443812-The-One-Level-60-Guide-Updated-for-2-5
http://forums.riftgame.com/game-discussions/rift-guides-strategies/410431-one-level-60-guide.html
There has of course been 2 patches since the guide was posted but it is still a good jumping off point to get into the PvE side of things.
I see you started out as a warrior and I'll tell you from personal experience that you should try all of the tank souls that you can. 3 of them are available without buying the extra soul packs.
You might find that you agree with me that while a warrior would seem to best but in terms of personal tastes/style of play Cleric and Rogue tanking beat out the warrior tanking souls.
If you want an all around character that has the widest variety of play styles without purchasing the extra souls Clerics can heal, dps and tank (in order of the options they have for those tasks)
If you are willing to purchase the souls then you might find the Mage a better option since depending on which role you like to play in PvE content for an mmo.
As for soloing going with a tanking soul and then other sub-souls is terrible. since the dps is lacking.
Warriors have a good option for a solo farming/world questing spec that you use when not tanking.
http://rift.magelo.com/en/soultree#7k2S9iQyw/8hhkFa9l9i/V
More information about the above spec is provided in post #22 of this page
http://forums.riftgame.com/game-dis...ind-solo-farm-godmode-spec-2.html#post4612618
if you don't have Tempest you can use Voidknight or Reaver for the 0 point soul. the former gives you a survivability buff and Reaver gives you a ranged damage ability.
The above build for Warriors has decent to good Single Target and Area of Effect (multi-target) damage balanced with a decent amount of survivability through some self healing and more armor and resistance to non-physical damage than just a pure damage build. You should be able to take down some Elite mobs of similar level to you one on one as long as your gear is decent for your character level.
having multiple specs isn't too much of a problem since the first few extra that you can buy aren't too expensive.
....