There are a lot of great videos on Youtube and also Craftsy classes for longarming that might help. My local library has a few good free motion books - maybe yours does as well. There will be a free webinar next Thursday, Dec 13th on HQ rulers & ruler work. I'm not sure if you are interested in ruler work. I believe they're going to make the webinar available the next day if you're not able to watch it live.
There's a few books out there on Amazon. I've got this one right in front of me. It's more modern quilting.
http://www.amazon.com/Free-Motion-Qu...arm+quilt+book
I'm not sure what style of quilting you do - that would also depend on what books/videos to suggest..
I own this one...
http://www.amazon.com/Ultimate-Guide...arm+quilt+book
I'm going to have to take it off the shelf and go through it. I had a midarm machine and sold it. I now have a Tin Lizzie sit down that I adore

There might be some super helpful things in that book for me as well.. if not, I'll ebay it out