adding records to access database: PLZ HELP

I am new in using database in asp.net. I am learning myself. i spent hours to
understand dataset, dataadapter, oledb, sql, parameters... and more.. I
understood some points and on some points I have still confusion. 

I want to make a simple comment system on my site so that user can post comment
on any article, photo, joke, wallpaper. You can understand what i want from the
following diagram:

 

At this time I only want to know how to add records. But I will be very happy if
you could post how to delete and edit any records.I will create an admin control
panel to edit or delete comments.

Another question: When I was trying to learn ADO.NET I found the following line
on a page:

Dim custOrders As DataSet = New DataSet("CustomerOrders")

Question1 : If custOrder is Dataset then what is CustomerOrder ?

Question2: I have seen many code where they use "New" word while
defining a variable. When "New" word is used. 

For example: 

Dim xz as New oledbconnection

Question 3 : If u know any good ado.net online tutorial (using access database)
then please post its link.

Question 4 : I want to learn ASP.NET using source code of open source CMS like
BlogEngine.NET or DotNetNuke etc. I can understand Visual Basic. These
applications are written in C#. What should I do?

futureking:Question 3 : If u know any good ado.net online tutorial (using access
database) then please post its link. 

http://msconline.maconstate.edu/tutorials/aspnet20/default.htm 

Access AND VB.  How lucky can you get?!

Just one thing.  Use parameters for database related tasks:
http://www.mikesdotnetting.com/Article.aspx?ArticleID=26