Influence sites to get protection money. At the start, search and acquire sites that pay high for protection, for example, Corporate Towers or Casinos.
Each gang has a different Chaos rating. The money made is determined by a formula that involves this rating. Note: Do not overdo it or you will attract police attention.
If you find a gang with positive upkeep, hire them immediately. Although the contract fee may be high, they will immediately recoup your losses in the next few turns.