Custom Knifemaking by Tim McCreight.
Takes you step by step through ten projects and leaves you in very good position to carry on with the rest of your journey. Each project exposes you to some new skills. It presumes nothing but hand tools to start and take you through selection or construction of some useful tools.
It is a bit dated, before some of the current 'best pick' grinders for example - and the discussion of steels misses some of the newer super steels, but it is still the best starting point I've seen by a wide margin.
Welcome to the journey.
Rob!