Help!

I bought this fine automobile a few months back and it was obvious it would need some love. I replaced the injector fuel lines because the originals were blown out, at the moment the alternator isn't producing any power and the temp gauge fluctuates between normal and slightly warmer than I would like. Honestly I love this car but know nothing of it, it's starting to become worrisome how rough it's running. I don't want to lose the old girl.