Starting in VS 2010 open your project
1. Create a folder for the module under DesktopModules called "SimpleForm"
2. Add a web user control to that folder called SimpleForm.ascx, make sure it creates a code behind file as well
3. Open the code behind and make sure the control inherits from the PortalModuleBase class
4. add using DotNetNuke.Entities.Modules; to the top of the code behind
5. on the SimpleForm.ascx file, create a div and add some starter text to it like "Hello World"
6. open the dnn site in a browser and login with your super user account
7. goto host menu and extensions, then use the manage button to create a new module8. set the source to control and then select the SimpleForm folder from the Module Folder drop down, then select your ascx from the resource drop down.
8. Name the module "Simple Form" and click Create.
9 when it is done, go to the page where you want your form and then add the simple form module to the page, you should now see your hello world text.
Let me know when you have this much and I will get you some more info, but basically at this point you can code the ascx like you would any asp.net control