@Yashar E.I am sorry for all who experienced a scammer.

Is it typical in a JV arrangement for the newbie to provide ALL the money and the experienced person to provide the know how and actually do the work (most of it anyway) for a 50/50 split? 

However, your client should expect an experienced investor to make their own calculations in order to present their offer.

Very experienced in Sales and in Real Estate Investing. 

Good topic Grant, hope we can get some help from those experienced investors here..=)

@Oles Street A good way would be to learn about what you want to do first by reading books and listening to podcasts, and networking with experienced investors. 

I would review your documents to see what they say.  

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This review is for both. 

although they both are interdependent.The best way to understand costs is to get a Floor plan drawn and get quotes from at least 3 people in the area who have done ADU'sIt's always a good idea to involves a professional right from the start, especially someone who is experienced as they will suggest techniques that could bring value and save money in the long run.