Hi, Richard.
Disclaimer, I've only played around with this for "fun." I've never deployed a working app for a paying client that was web-enabled and actually put into use (anti-cloud/scared-bunny small business owners).
That said, the answer to your question partly depends on which version of Access you are using. Version 2000 and 2003 had a "web form" option that saved the screen form in web-friendly format... HTML or XML, if I remember it right. For version 2007, the accepted practice is to do it in ASP.Net. Looking online just now, I'm seeing where version 2010 wants to go via sharepoint. Either way, you are probably looking at a pretty straightforward process... if you can get past the "grey f'in goo" (to borrow a phrase) aspect of M$ lock-in.
For more info search "MS Access web form". You'll also see sites for 3rd-party tools, of which I have no first-hand knowledge.
Regards,
-DG