I received the Brother PE770 for my birthday last December. I bought medium weight tear away, water soluble stabiizer, pre-wound bobbins and some extra empty bobbins from Amazon. I did a lot of thread research. I ended up buying all my polyester thread cones at Threadart.com. I also bought SewWhat Pro 64 (it's a downloaded software program that lets you store and edit your purchased embroidery designs). I also bought a good pair of long tweezers and a pair of double curved machine embroidery scissors.
Have fun.