Well, problem solved.  It was the starter.  My friend came over and
banged on it and the car started right up.  (which is a pretty cool
trick to remember if your engine won’t crank.)  To answer your
questions, I replaced the battery at the end of the summer when I got
the car.  All the accessories like the power windows, radio, and
lights all worked fine, and I even tried jumping it, So I’m pretty
sure the battery is OK.  And about the injector, I could see and smell
gas leaking from it, so I’ll have to replace the seals.  Other than
that, it’s running fine now.
Thanks for the concern