Follow this guide:
https://developer.valvesoftware.com/wiki/SteamCMD
or in short:
when you open steamcmd.exe, type following commands:
Code:
login anonymous
force_install_dir ./hlds/
app_update 90
app_update 90 validate
app_update 90 validate
app_update 90 validate
Then you have to open notepad and write following:
Code:
hlds.exe -console -game cstrike +maxplayers 20 +map de_dust2
Save this file as start.bat in your server directory. Double click this file and server must start.
If you want anything more like admins, etc., you have to install metamod and amxmodx.
Hope this short guide will help you.