Well open up your console (not F10.. who ever told you that is an asshole. cuz F10 shuts down the game).
If you cant open your console, navigate to "C:\Program Files\Steam\steamapps\"your username"\counter-strike source\cstrike\cfg" and open the config file with wordpad.
Then find where it says "bind "~" "toggleconsole"" and put another key instead of ~.
For example. "bind "F3" "toggleconsole""
Then dont forget to go to the advanced keyboard options in game and tick "enable console"
Then ingame open up the console and first type without quotes: "svcheats 1". then type "cldrawhud 0"
Hope i helped and good luck :)
Btw; WELCOME TO FPSB! :D