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Sub 40 10k(r/running)
My advice is start with either Jack Daniels’ or [Pete Pfitzinger’s] (www.amazon.com/Advanced-Marathoning-2nd-Pete-Pfitz…) books. They are quick reads that have everything you need to know to get started on racing a marathon (or half). Both books are organized well so you don’t really need to read them cover to cover. They cover both the science plus have appendices with exact daily plans to follow.
I guarantee you that you will be much better off spending <$20 on one of these books then wasting a lot of time trying to piece together free info on the internet.