I made
a Custom Melee Map with simple GUI triggers. You should download it and look at the trigger editor. Also, look at the object editor to see the custom races. There are a lot of other custom maps here on the hive but I think mine might be useful because I'm relatively new to triggers and its not that advanced. The best way to proceed is to come up with an idea / theme / map concept. Then start downloading models, skins and icons. Then when you want to make things happen that are not standard game functions google search "world editor (your question)." For example, try "world editor color text." This will find you a tutorial explaining how to change the color of text in-game. Try "world editor preview screen" this will bring up sites on how to create a custom preview like the one you will see on my map in the link above. Other things you might want to know - importing skins - importing icons - importing models - environmental effects - adding a sky - lighting settings - terrain tiles sets - custom items - custom units. Basically when ever you have a specific question try google first - this will bring up hiveworkshop tutorials as well as those from thehelper and Wc3c, but then if you still can't figure something out post a thorough description of what you want to happen and a copy of the trigger here and ask for help. Be specific and detailed to get the most useful answers. Good Luck and Have Fun!!!