The problem was never starting.
You have begun novels before. Possibly several. Somewhere around fifty thousand words the structure gave way, and the draft joined the others.
Most writing books tell you what shape a story should be. This one governs the order in which you decide it.
Seven stages, from first idea to finished draft. Each does one job, each depends on the one before it, and each ends at a gate you must pass before going on - so you always know what you have settled, what you have not, and what changing your mind will cost.
It will not make writing easy, and it cannot promise you will finish. No book can. What it removes is a common reason drafts stall: writing on while the structural decisions are still open.
You can check all of it. Every novel used to demonstrate the method is public domain, free to download. All eight worksheets are printed inside. There is nothing else to buy.