This is the ultimate guide to be a pro in TDP4:
Step 1. Buy 1000000000000000 of kreds.
Step 2. Buy 10000 cash and 10000000 coins with you kreds.
Step 3. Buy every artefact and gun in game.
Step 4. Kill non buyers with glock.
With my guide you will be a pro for 1000000%!! :)
Hope this helps.