How do I set up credit card or Pay Pal payments for an online business?

I have been toying with the idea of setting up an online tutoring business. I just came across an online whiteboard that I think will make this fairly easy. I would of course set up a Web page for the business. I am thinking of keeping it pretty simple. Anyone interested would send me an email. I want to know what I would have to do to automate payments. Is that difficult to set up? Are there any general packages for setting up a business that does things like keep track of customers, payments and appointments?