Getting the form field values using vbscript is pretty easy and straightforward.
First to grab a form field that was submitted using the post method you would use:
<%
myvariable = Request.Form("myformfieldvariablename")
%>
And to grab form fields submitted in the Querystring using the GET method you would use:
<%
myvariable = Request.QueryString("myformfieldvariablename")
%>