Financial questions that need an answer

I run a fitness center and when I am out of the office I get many telephone inquires and have trouble keeping up on who called and when I need to call them back and It seems I am loosing many leads because of my inability to manage theese calls effectivly. I was curious to see if there was any software out there that would assist me in keeping things in order. I am kind of having the same problem with email as well. So if you know of something for both…that would be awsome!!