I have had a handful of these machines with the "New Home" rotary system, and the cast iron ones have all sewn beautiful stitches, smooth running also (I have an aluminum body poor man's FW version, noisy and not so smooth). Needles are hard to find, Boye 2 1/2 or CC1221, and bobbins are even harder; hopefully you have some of each.
If your machine looks like the one pictured in the manual Janey linked to, then it should get you started.