Well first I'd go and loot the local gun shops, so we had protection from anyone thinking they can bundle in and cause havoc. Then I'd loot the supermarket and get long term sustainable foods ( tinned etc), also likewise chemists for things like anti-biotics,then I'd loot the local garage having taken a tanker from the farm so we had fuel for vehicles electricity etc, then I'd find a strategically easy to defend position and recruit people who aren't as bright as me as there is safety in numbers. I would also try to establish a communication network of sorts to identify people wo could be of long term practical use like Drs, researchers, engineers etc and gather them together and try to rebuild.Then you are prepared for all of the worst things should they ever happen, which of course hopefully they won't, but by and large in situations like that warlords prevail for at least the first few years, so it would be quite likely that there would be skirmish like local wars for some considerable time.