Paypal has a short demo on how to do this:   https://www.youtube.com/watch?v=l3e1uzMhiV8

As Richard says, you need a Paypal business account, and you need some HTML skills.  Paypal does the hard part for you by giving you a "payment button" for you to put on your website.  But that button comprises of HTML/ASP code, so you need HTML skills to put that code onto your webpage.

Richard has already alluded to the importance of security in this, so I'd like emphasize again:

You DO NOT store credit card info in your Access database.  If a breach occurs, YOU are responsible and prosecutable, as Richard says.  Access doesn't have strong enough security for this.  Payments are all done on your website.  Users type their CC info on the site only.  Your Access DB doesn't see or touch anything sensitive that could potentially make you liable.

Your website needs to be a SSL-secure site (i.e. https://), obviously.  You need an SSL certficate that comes with an annual charge, and you likely need a more expensive web-hosting plan too.  For instance, the cheapest $5 a month Winhost plan does not support SSL.  You have to get the $10/month plan.

All the things above are web-based, so Access doesn't really get involved.  So I don't know if Richard wants a seminar here.  Maybe a few HTML/ASP seminars specifically designed for Paypal payments.  Or maybe a tech help video to show how much cost is involved in this: web-hosting, SSL, cost and time to learn HTML skills, etc.