I have a Brother 770 as well. I recommend checking out the videos on youtube by Vince Acuri(sp?). Just search Brother 770 and his videos should come up. He saved my sanity yesterday when I had to go back and see how he puts his thread on the spool. He has a video that is over an hour long for the new owner that is super. I have been getting my stabilizers, prewound bobbins and temporary adhesive from Amazon and I purchased a bunch of thread from threadart.com. Threadart also has designs and a digitizing service which is kind of neat. I've purchased a couple of designs from Embroidery Library and one from an etsy shop. There are lots of options for designs. I'm using the Sew What Pro program to incorporate purchased designs in my Brother 770.
Have fun with your new machine