proposed runnning plan

The below build-up can/should be done with 2 - 3 days training per week. Some steps may be required to repeat if needed.

20 min walk
40 min walk (...repeat this+previous?)
55 min walk
run 30 sec / walk 2 min / 30 min total
run 30 sec / walk 2 min / 40 min total
run 5 min / walk 2 min / 30 min total
run 5 min / walk 2 min / 40 min total
run 8 min / walk 1 min / 30 min total
run 8 min / walk 1 min / 40 min total
run 10 min / walk 2 min / 20 min run
run 15 min / walk 2 min / 30 min run
run 12 min / walk 1 min / 24 min run
run 15 min / walk 1 min / 30 min run
run 30 min
run 20 min (...repeat this+previous?)
run 3 km (6km/h in 30min)
run 30 min (...repeat with increased speed)
run 4 km (8km/h in 30min)
run 30 min (...repeat with increased speed)
run 5 km (10km/h in 30min)
run 30 min
run 40 min
run 30 min
run 50 min
run 30 min
run 8 km (8km/h in 60min)

(60min / 30min) * 4km = 8km/h
60min / (8km/h / 4km) = 30min
60min / (8km/h / 8km) = 60min