Buy Zone?

[-Psy-]

Could someone tell me how to make a buy zone entity?

 

[Phisionary]

make a brush where you want people to be able to buy things. press ctrl-T or select "tie to entity" from the menus. Scroll to the "func_buyzone" and select it. Set the team the buy zone belongs to.

Done. More important to you right now, would be learning to use This invaluable resource.
Most people will not help you with questions like this.

 

[Dead-Inside]

He forgot to mention that you should make it textured with the tools/trigger texture.