What you have is a 15-clone. Most everyone agrees they are very good straight stitch machines.
You can find a manual for it at
http://ismacs.net/singer_sewing_mach...ion-manual.pdf There are lots of threads here on QB about 15-clone machines. If you use the search box in the upper right corner on this page, the will be lots of results. Unfortunately, if you click on a link the posts will be blank (a problem they have been having on this board for over a month). You will just need to refresh or reload the page to be able to see the posts.
One thread here is at
Will the Real 15 clone please stand up For some reason, I think that if you click the link, you will not have to refresh to see the posts. Fair Warning Message: There are several pages in that thread.
Janey - Neat people never make the exciting discoveries I do.