To finally walk out after a life underground would be quite a shock. Life was so safe, now almost the polar opposite.Everything is new and unknown.
First step is to scout out a camp or settlement while keeping out of the way. Get in, see if they're friendly, find some armor and a good weapon. Rob them blind if they don't seem sympathetic, make friends if more promising. Preferably be friends with big brawny mutants, better have them on your side in a fight.
Then get rich, find a lady friend and settle down in the middle of mutant town, preferably the other side of the map from friggin' deathclaw valley. Grow some trees and a vegetable garden with seeds from the vault, everyone'll be jelly.