You can earn experience for roleplaying in #Arnia.
How much? 100 experience per day for a decent amount of activity.
How much activity do you need? Well, it varies.
Interacting with someone in a meaningful way qualifies you.
Roleplaying by yourself for a decent amount of time also qualifies you.
If there's no staff member around, you can post the logs in the Adventure Updates section of the forum, and the staff will review it.