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You have wrong approach to this. You need some plan so that all your questions are in some reasonable context.
You don't just ask: "How much wood I need to build a house?". You ask first: "What kind of house I am going to build, how big it is, what it is like?" Then you can calculate how much you need and what. And when you know what it costs you can calculate your desired profit margin (and hope that customers agree with it too).
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