Well that might be a good start...and mapping questions on here are normally for (slightly) more advanced things than 'how do I make a brush?' (which incidentally couldn't be any more straightforward  ) Ther...

So you finally figured out what the Mod Tools and Radiant are then?  The features of Radiant are far too much to go into in a single post, there are loads of tutorials on Youtube anyway is it really that har...

Ummm....I'm lost for words...

Please tell me this is just a troll and you're not seriously starting to make a map without knowing what Radiant is...please...my faith in this community is low enough as it ...

Eh??  ??? You mean Radiant or what?