How to Flip Baseline Guidelines for Horizontal Book Layout in InDesign

Alright so i short, i need to make a tiny book and i want in to be laying horozontally, and i want the book to open from the longest side (so the top or bottom) to do this i make the pages be in protraid mode and then in the document it self i fliped the 90 degrees, but in doing that i didnt flip the base guidline. is there a way to do this so the baseline isnt horizonal (when i didnt flip the pages) but vertical so when i flip the pages it lays horizontal? please i need help fast!
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