Here are a couple step-by-step instructions on how to create some GUI elements. Namely a clickable compass for moving around and a tabbed window that can be used for whatever you want (chat box, quest info, eq, inv, etc.).
These walkthroughs assume you know a bit about Mudlet. But if not, the termonology can be found in the Mudlet Manual or Geyser Manual. If you find you like the scripts, but can't follow the instruction's lingo, you can simply copy and paste each block of code into a new script and it will work perfect!
http://wiki.mudlet.org/w/User_talk:Akaya
Enjoy!