Congratulations on your Bernina. A great price! When I bought my emb. machine the dealer said to use Isacord embroidery thread. It is a polyester thread, and holds up well for items that get washed like quilts. My 180E only likes 100%cotton in the bobbin thread when I'm embroidering. My dealer also suggested having 2 bobbins, one for sewing, one for embroidering, they usually will be adjusted differently. And don't forget, you will need embroidery needles.
You don't know what color emb. thread to buy until you buy your designs. The designs will have a list of colors you will need for each design. You can build on your collection as you go. Its a good idea to buy a storage system for your thread. I have a June Taylor rack hanging on the wall next to my machine for easy access. Of course theres stabilizer, 505 adhesive spray. Have fun. :thumbup: