Definitely search youtube for some basic longarm videos. You want to look for ones that tell you how to change the needle, thread the machine, oil it, etc. I learned how to sew on a regular machine when I was about 10, so I figured with my many years of sewing that using a longarm would be easy.
WRONG!
The directions that came with my machine were about a dozen sheets of xeroxed instructions just stapled together. The pictures were small and hard to see any details. Youtube has become my best friend. I have taken lots of notes on how to do the basics. After 2 years, I still consider myself just a notch above a beginner. I kept telling my husband that I just want to quilt, but with a longarm you also need to be a mechanic to understand everything.