You'll probably see announcements of favourable supernovae on the pages of IIS, but you can also keep track of recent supernovae at the Rochester Academy of Sciences page of
Latest Supernovae, which gives you a listing, in order of brightness, of known supernovae around the sky. With a 10" dob, anything fainter than about 13th mag will be a pretty challenging target, and 14th mag will be really tough even from a dark sky. Not impossible, depending on how good/practised your eyes and optics are! You'll also need a photograph or good finder chart so you can be sure you're seeing the SN and not a faint foreground star. The bad news is that supernovae brighter than mag 13 are quite unusual, though there have been several in the last couple of years... so be patient and keep on the lookout for bright discoveries!
SN2013am in M65 doesn't seem to have brightened to reasonable visibility despite being observed for a month (still near 16th mag), so I wouldn't hold a great deal of hope now that it will brighten enough. Maybe others can correct me if I'm wrong!
Good luck, and happy SN hunting!