I think you'd agree that any advice is completely universal. Selling preorders is a solution for most cases, but we of course can discuss the exceptions. If you

I think you'd agree that any advice is completely universal. Selling preorders is a solution for most cases, but we of course can discuss the exceptions. If your selling process is different than "get money -> ship the product" than you will always encounter cashflow problems and maybe it isn't so wise to start such a project as a startup.