As to where to start, I'd say route planning and looking up weather data to pick the optimal time to begin. Included with route planning is checking elevation profiles. You live in a pretty flat area. Have you had any experience with some serious climbing? If not, that could be a major issue for you.
As far as food & water are concerned, it shouldn't be an issue if you are aware of what you're likely to need in the upcoming days and plan accordingly.