I'm downloading the trial ahead of the F2P, thought I'd give it a go. Is the kinship still going, and can an ultra casual join? Also do I have to RP a lot (I see its on a RP server)?
You don't have to RP on the RP server, just be respectful that others might be roleplaying so don't stand in front of themr yelling about chuck Norris

Oh and pick a reasonable name, calling yourself buttmunch tends not to last long on an RP server

But no, you aren't forced to roleplay and you'll appreciate the player RP events even if you aren't an rper yourself as it adds atmosphere.
Another good tip is to join the global lff chat channel as it works across all the zones and is the most active chat channel I know of on the various lotro servers