Man, I pick school over the rp for a whole day and I come back to a giant, exciting plan. :3 All right, I'm really late, but here goes.
I'm still working on just how I'd like him to meet up with the party. I guess it would probably be before or just after he heads into the forest, since he's been putting off his great adventure to find his clan again. I suppose I'll have to consider it, so if anyone has any ideas, I'd be glad to hear them.
As for walking order, that looks good; I imagine Eresir would probably skulk around the back edges of the party for the most part: he's a bit nervous about heading back into the forest after so long. I imagine he'll probably be excited to meet Falina, 'cause he thinks dwarves are pretty awesome. xD
He's good to share a tent with anyone if sharing is necessary; Eresir's not too shy about that sort of thing. And whenever he actually joins the group, I think he would probably sit cross-legged next to the fire, except when he disappears into his tent to write.