As someone who is deeply involved with startup studios, here are a few hints.
1. First, calculate your optimal scale of operations. In our startup studio this was about 12-15 people core team + dedicated ceo-s for each startup experiment
2. Raise funds for the studio, for at least 12-18 months. Your options:
- use your own money
- do agency work
- get direct VC investment (hardest one, you will need traction)
- get corporate financing
3. Raise funds for your startups that are ready for it.