There are a lot of modules that can be used to diaply articles in dnn, maybe you should install one and teach your client.

If you must creat your own module, the text input is acutally easy and the dnn:texteditor control is already implemented with a editor.

I would download the starter kit then go thorugh some tutorials on using the stater kit.   Once you done that, I think you should

crreate the page dynamically using a module.

Just get an instance of the article based on the ArticleID and display on that module.

Steps

1. Create a new module using the starter kit in your developmental dnn installation
2. Change the object in App_Code/YourModule_Info.vb to reflect the fields in your article table.
3. Modify the App_Code/DataProvider.vb and App_Code/SQLDataProvider to access your table.
4. modify the App_Code/YourModule_Controller.vb to alllow access.
5. Write the sps that you need for the YourModule_Controller.
6. Create a browse/search page as the default view page- ViewYourModule.vb (using datagrid) in your DesktopModules/YourModule folder 
   use the default view page.
7. Create viewArticle page - custom article diaplay page  in your DesktopModules/YourModule folder: Set Control Key to "Article"
   This needs to be a new custom web control you add in addition to the default pages.
8. Build links to call the ViewArticle page from the default view page.
9. Modify EditYourModule page in your DesktopModules/YourModule fodler to reflect your table.
10. Create the module package
11. instaall the package in your client's dnn site.

have fun.