1. Go to "documents",
2. Go to "German Truck Simulator",
3. Go to "config" or "config.cfg",
4. Open it with "Editor" and save that for all config-files,
  then look for:

 uset g_console 0
 uset g_developer 0
 uset g_police 1

and set this to:

 uset g_console 1
 uset g_developer 1
 uset g_police 0

Then start a new game.
Then press ^(left from the number 1),
when you have do all correct, you will see a console!
(When not, you have do what wrong!)

Then write in console:

Code            Effect

cheat money   - you will get 500000$
cheat driver  - you will get a driver
cheat company - you will see all company names