The only things you need to create an interface:
1. Some kind of text editor - Notepad or Wordpad (both come with windows)
2. A graphics editing program that can deal with Alpha Channels - Adobe Photoshop (pretty expensive), Paint Shop Pro (free trial), or Gimp (I have no clue about this one, sorry)
3. A good idea for a UI!!
That's it! Now teaching you how to do it is a little more difficult. Good luck though!!