In general, try to put your idea into paper using something like Lean Canvas [1], [2].
Cover the following aspects: technology, organization, people and processes and how these tie with the business context (using the lean canvas).
If your venture is going to require software development, you can
- design and develop a prototype / work on the MVP
- identify your target customer segments and talk to real people seeking their input
- build a landing page and write copy for your product
- put a list of things you need for your venture and prioritize to identify the bare-minimum needed to start
- read about company starting procedures
Cover the following aspects: technology, organization, people and processes and how these tie with the business context (using the lean canvas).
If your venture is going to require software development, you can
[1]: https://leanstack.com/lean-canvas[2]: https://www.google.com/search?q=Lean+canvas+template