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1. You will need WML, and not HTML to run the websites on mobiles. A WML tutorial is available from *www.w3schools.com. Traditional HTML can also be viewed on mobile but from my experience its frustrating because the download speed is slow and the screen is too small. May be your logo will take all the screen. So your visitor will end up getting frustrated by scrolling the page every now and then.
2.You can create WML sites using any simple texteditor like notepad or Notepad++.
3. Opera lets you browser WML files on your PC.
4. I don't think you will need wap.XXXX.xom, just make sure that the page is created in WML
And I think Google had launched mobile ads too. So just chk it out.