Congrats! I upgraded to the 7700 a few weeks ago - love love love it!
One of the things I like to do is to create a 'Stitch Map' for myself. Take a 4 or 5 inch width-of-fabric cut - I used cream muslin - leave it folded and stick a scrap of batting between the layers for a little mini quilt sandwich. Then do a line of each stitch that's on your machine. Amazing how different they can look stitched out compared to the teeny diagram on the display.