After starting a new game, start your own syndicate. You can choose to rob a bank, and by doing this by yourself you can get around $50,000 dirty money. You can choose to keep this or launder it. By laundering enough, you can drive the rate down to about 6:1 or 7:1. That means that instead of 20 dirty for 1 clean, you get 6 to 7 dirty for 1 clean. This is an excellent way to get money immediately.