The first step to designing anything is to come up with an idea.
Before you even start modeling, you need to have a clear idea of what it is that you want to make.
The best way to start is by sketching up some ideas for a map on paper, come up with a basic design of the map.
The idea doesn't have to be flash, just any rough sketch will do, as long as it presents you, the designer,
with a good layout of what it is you want to do.
Below, you will see a sketch I have made up of the map I'm going to base this course around.
You have two choices:
1- emulate this map (which is available for download in the final tutorial page)
2- or create your own.
Seeing as this is your first time creating a map however, I advise you to keep your map simplistic,
the more complex the map, the more likely it is to become error prone.
I would advise you to make an 'artificial map' to begin with, IE, one without any natural features,
as this will be easier to work with during this process of making your first map.
1: Sketch up a design for your multiplayer BSP
Once you have an idea in mind, then you are ready to proceed to the next step and begin creating it in Gmax.
(or 3DS Max, but I will not be covering that here)