1) what are your interests?
2) where do you want to go (put some dots on the map)?
3) join the dots
4) estimate transit times (based on average speeds - for us 70-90 Km/h highway, 40 Km/h unsurfaced roads, “off road” could be 20 Km/h to 30 Km/day; overall daily average 170 Km, average driving time 4-6 hours/day)
5) add some transit stops where you can’t get from A to B in a day.
6) decide how long in each stop - typically 1-7 nights)
8) estimate fuel, food, water etc., needs
9) pre-trip vehicle check (and maintenance if appropriate)
10) daily check, change driver every 2 hours (every hour on difficult trajectories)
11) have fun!