It is not clear in your statement what you are afraid off specifically. It sounds like a mix of "making work for free" and "staying somewhere forever". Don't t

It is not clear in your statement what you are afraid off specifically. It sounds like a mix of "making work for free" and "staying somewhere forever". Don't think too much about it now. What is done is done and you will learn from your errors if indeed something didn't pane out as planned. For the paying part you should have a solid contract and be 100% clear with the client about the money situation.