Starting out, you get to choose what vault (what part of the us/canada (if there are vaults in canada? idk)) you are born in. After a short tutorial section in the vault, you mature and are forced out of the vault because there is no more room. Since many vaults were used for experimental purposes, i think a good idea would be to implement the "secret bonus" that has been talked about as a unique perk you gain from the experiments running in your vault.
Players leaving the vault as soon as the server begins will find themselves in a world full of ghost-towns, raider camps, BoS camps, slaver camps, etc. For early protection against the dangers of the wastes, they can join an NPC faction which will have limited capability to help, with the main attribute being the best protection (Some of the main NPC HQ's will be non PvP, so players who want to just have a place to sit and be safe can do that). Also, historic Fallout cities like Rivet City should be included as safe and non-PvP, and non-conquerable.
For those of us who want to explore the wastes and face the day to day dangers, after you feel confident, you can start your own faction. the faction would start as a few roaming wastelanders, who purchase a Brahman to haul around equipment like tents (and members of the faction that are logged off) With enough skill and coordination, they may be able to eventually take over a ghost town or a small raider camp, and convert it into a settlement, allowing more players to join their faction. Players would then go on raids searching for materials (scrap metal/lumber) to build their houses.
When the faction has gathered 100 scrap metals and 40 pieces of lumber, they can choose to construct a house. You may be able to enslave near-by NPC’s to help build, and the more players actively building the house the quicker it will go. After the leader gets his house, his first few followers can have houses built. Build an inn, where a Player can have a job selling tenants rooms, and while he’s offline there could be a NPC that runs the inn. You can build an armory, library, extra houses, Brahman pens, slave pens, or even a Megaton like wall around your town which you can build Mark VIII turrets on, a community vehicle garage, etc.
It would be up to the faction leader to build up defenses enough, and only let respectable people into the town to ensure its safety. Eventually, you could have a thriving town on your hands, or a new ghost town after the raiders came to take their camp back. The leader could employ jobs such as pilot (to carry members in a vertibird to their raid, and to come back with their goods) that would only be available when the player responsible for the job was online, or jobs like store owners that if left unattended by the player in charge of it, a NPC will fill in and take all caps earned while he’s on shift.
Lockpick, Sneak, Spying skills would be invaluable if you plan on making a living as a drifter or mercenary who would gain access to developed towns, and attempt to rob the town blind. If caught, the entire town will turn hostile, and NPCs will shoot on sight. Or maybe your faction sent you to my well developed faction (we started searching the wastes for unique (one of a kind) weapons and uncovered a MIRV and some others) so that you could steal these one of a kind weapons and use them against us. It would be wise to purchase locks to put on your house and valuable belongings.
Well.. that’s all I have for now, but id be interested in hearing your ideal fallout world.