Need code to automate web browsing in VB2005

I am a very novice programmer just working on a program as a hobby. I am using Visual Studio 2005 coding in Visual Basic. I am loading a form that contains a web browser control. I can navigate manually and work the the control in all the normal ways. I don't know how to navigate through web pages automatically - like entering text in forms, or selecting options from drop down menus, and then clicking a submit button. All I am looking for is a snippet of code that is documented so I can modify it and put in my variables as necessary. So I can then use it to look at the source code of a web page I have in the web browser control, have my program pick the options I need or put text in a text-box field on the webpage, then click a submit/go button. I have many different websites/circumstances that this would be used for, so I just need something generic that I might be able to understand how to put it into my code. Remember, this should be for Visual Basic 2005 using the WebBrowser control. Thanks!