Take a couple months to develop a complete Minimum Feasible Product, before testing if some clients are ready to pay.

Bootstrap your project with little or no tech, and achieve quick wins.

Ask for funding from friends & family, so that you can launch an aggressive marketing campaign.

Make before you sell.

Minimize variable costs thanks to technology.

Propose 2 or 3 alternatives to help your clients to make choices.

Sell before you make.

Minimize fixed costs & IT developments, until you have achieved predictable revenues.