Actually, the best way to find a good, active fellowship is to first look on the forum under "fellowships seeking members." Make sure to look at the one for your own world. I'm on Sinya Arda, and I am in a very active group, Thornwood, so you'll see our ad under that world.
The second way is to look at the overviews of fellowships by clicking on your ranking number at the top left of your screen (when you are in the game.) Click on the "fellowships" tab, and click on the names you like. You'll be able to read the overview there. Write up a list of several fellowships and take that list to elvenstats.com ... then type in each fellowship name. Find out whether they are active (if you see too many black triangles next to the names of members, then they aren't active.) Also, see what kinds of "boosts" they need. If they need your boosts, you'll be all the more welcome. Good Luck!