1. Pick new york city (lol)
2. Convert everyone into squads and have the spare manpower start collecting metal scrap
3. Send your squads to atleast collect 30 canned food plus 30 bullets
(MAKE SURE YOU FIND A CAR AND ASSAULT RIFLE)
4. Once you have enough scrap surround your small HQ with 2 layers of metal walls,
5. Make sure your solo survivor has the Assault Rifle and has at least Veteran level
6. Start killing off your people, make sure nobody is working and keep making squads and send them 7. off to die (Make sure they don't have guns on them or bullets)
8. Survive waves with one survivor, if the hordes are too big then copy the scene from I am legend and start driving your car around or run over the infected, you don't want them to start attacking your HQ.


Eventually the solo survivor will reach ELITE level and won't miss their shots, if the HQ is damaged then start repairing it right away with the one guy you have.