http://www.singerco.com/accessories/instruction-manuals
That is a link - just type in 328 and you should be able to get a manual.
Looks like it does zig zag and takes disks!!!! Wow you did good! I bet once you get it up and running that machine will rock. I bet you can treadle it too. Some old Singers have knock out on the side of the base. Check the needle size.