for maps, just get some county maps from local stores. you can probably buy more maps as you go. no point in planning too much because you might take a wrong turn or a bridge is out and you have to change anyway.
forget 13 mph or whatever the time google estimates. I ride about 10mph. you don't want to get exhausted! just take it nice and slow, especially to start. 24 hours is a better estimate of elapsed time for planning purposes. leave at 3AM!
Stop every hour or so and walk around and stretch.
important --> eat and drink steadily. you mostly just need carbs. I can get really good bread and I just eat bread a lot of the time. eat a bit at least every hour. you need fuel!