The first thing I'd do is clean the machine. You can download a manual either from the Singer site or Jenny at sew-classic. You need to remove the screw holding the cover to the feed dogs. My 'professionally' cleaned one arrived with that area packed with compressed lint. Be sure to line up the little finger on the bobbin case holder in the slot in the bottom of the plate when you put it back together. Are the feed dogs all the way up? My AnnieRose sews a perfect seam. I haven't played with my second one yet. I made a mistake and bought a long bed and I'd rather have a short bed.
Your black machine is very pretty.