probably a snowball system:

invest into a venture, show the production-progess to pursuade credit-givers to invest into it too.
(as you can actually proove that real-world partners are working with you)
Then use this money to invest into the next (bigger) venture to
pursuade other credit-givers to help with additional investmnts on
that project.

This way you can work yourself up to huge-financed ventures.
And run away with the invenstment funds of the last project.


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The trick is to have "credibility and trust", wich you
archive by prooving that you work with real-world partners,
and giving incentives to pursue these ventures without
very deep analysis by them. (e.g. Showing a suitcase with
money as upfront payment).