For creating an excellent map you should follow these instruction:
1* Follow the steps listed in this document to get up to speed building multiplayer maps for up to six players. With a few extra steps, you can turn your finished multiplayer map into a Skirmish map.
2* Designed Like an Art Tool. The menus, tools, and their uses are derived from desktop art tools. If you're familiar with traditional art software programs, Worldbuilder will feel very comfortable.
3* What You See Is What You Get. Interact with your maps through the same engine as the game. Visual toggles and camera options in Worldbuilder allow you to position the camera anywhere over the map and to view some or all of its components at any time.
4* Many Environmental Settings. Use textures and settings to place your map in a wide range of geographic locations with varying simulated weather conditions at any time of day.
5* Small Output. Created maps are small enough to e-mail to your friends who also play Command & Conquer: Red Alert 3.