so I got the orange box ,how I get the sdk thing?

[<RJMC>]

I just dowload it from steam?

anyway I dont plan to do much,just things like custom maps and things like that nothing too avanced

for example I rember a map called antlions attack or something like that that was you inside a base in a desert whit tons of antlion attackings,thats a example of thing I would like to do

 

[Beerdude26]

Go to Games, then click on the "Tools" tab (the tabs are at the top of the window), then click Source SDK and let it download. To actually start mapping and stuff, read some tutorials. www.interlopers.net is a good source to start.

 

[AtomicSpark]

It comes with a read me. Read it. Source SDK is usually has some difficulties working on a fresh install.

 

[Hectic Glenn]

Also if you're into playing that mod you can download it here - Antlion Troopers Deuce