[Since you did not mention anything about your experience or complexity of your DB, we will start with basics ]
This is where you start:
http://asp.net/get-started
Watch this video:
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Watch ASP.NET Development in Action

Watch how easy it is to build a “to do” task list application
from scratch using ASP.NET 2.0, ASP.NET AJAX, SQL Server Express, and Visual Web Developer.
Microsoft’s Joe Stagner starts by creating a fresh database and the code
to access its data. We then see how to define a ToDo List page that displays
and updates content in the database. Finally we learn how to add AJAX
functionality to the page to improve the user experience. Duration: 20 minutes, 23 seconds.
Watch the video | Download the video | Get VB code or C# code
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and
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How Do I:
Create Data-Driven Web Sites? (13:41)
Watch the video | Download the video
Get VB code or C# code
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If this is too much to do...
then you should look into hosted SharePoint account, upload your Access file and create data lists from it...those can be edited online. $20+/month for most SharePoint hosting.