First of all, check what i have for food and water supplies, scout the surrounding areas for more supplies,
make sure i have a weapon, reason being is that anyone else that survived is most likely gonna have the same idea as me, and want my stuff.
lastly, a secure and fortified shelter from the elements and other survivors.
after that i'd probably open a trading post or grow crops, or make a fortune selling water that i can make from solar stills,
( solar stills are factual, and they actually work too, if any wants to know how to make them, just ask. unless there's a war coming and you live in ireland) heheh.