Form 8947 has nothing to do with selling a home. Did you mean 8949?
You don't fill out the forms yourself. You enter the information on the TurboTax screens and TurboTax fills out the forms for you. That's why you use TurboTax. Form 8949 and Schedule D will be included in your tax return.
You do not have to show how you arrived at the basis. If the IRS has any questions about it they will send you a letter asking for more information.