Here is an article describing the steps on how to design maps for Counter-Strike. There is plenty of information in the article that is helpful to anyone seeking information about the design process of map creation. Very useful article, and well worth the read. http://www.worldofleveldesign.com/c...s/csgo-how-to-design-gameplay-map-layouts.php
This is also a very helpful series using counter strike. That is just a link to the first video but the rest should usually be in the related videos and actually all of his videos are somewhat neat.
Here's another thing that I came across some years ago, editing with the source engine. https://developer.valvesoftware.com/wiki/Category:Level_Design_Tutorials http://www.tophattwaffle.com/tutorials/