You could do it now if you had the $.

Purchase a cs-2 for about 10 million. https://www.cerebras.net/product-system/

License an established llm for ? millions

Purchase a Boston dynamics robot for 100-200k

Hire one phd and a few techs to help out for probably 2 million / yr

You’d also need a building with adequate cooling/infrastructure and lots o electricity. Both very pricey.

Most companies have been messing around with stuff for years. The only requirement for entry is $