Hello everybody.
I already have a good knowledge about triggers and everything. Only want to know what program you use to create the design of the map, to get all straight and centered, if possible tell me how to do this would be a hand on the wheel. Thank you.

People just use the standard editor for terrain and map design. To get it perfect just requires counting all the tiles and making sure it is right. If you want a map with angled and straight bases then you can use the p8 LOS trick. By that I mean create a new map, goto units and select player 8 and the map will go black. Place an unpacked trebuchet in the middle and then trace around the outside of the visible area with a terrain. Repeat to process as much as needed.