I managed to get Preson Garvey from a lunchbox, just look at those stats, I've stuck him in the training room for now to improve his luck. Currently up to 84 dwellers & at least 10 wandering the wasteland collecting loots & caps.
Exploring the wasteland is the best way to gain new weapons & armour, I usually send dwellers out in the morning armed with 10 stimpacks & 5 radaways. Monitoring their progress during the day a few times & then usually before bed if they are down to a few stimpacks I recall them back to the vault.
Currently I'm on 62 dwellers now & I have 4 dwellers constantly wandering the wasteland for loot.
I've unlocked all the training rooms & just saving the caps to start building a nuclear reactor.
One of the many surprises to come out from E3 was the release of Fallout Shelter. An mobile/tablet game which has you looking after your own vault managing the people, resources & challenging the wasteland. It's similar to any resource management game like tiny tower etc but it's FALLOUT !! & it's free. You can if you wish spend money to purchases lunch boxes which reward you with resources, caps, armour, weapons or new dwellers.
I currently have 35 dwellers, some equipped with armour & weapons. I decided to go for the layout below because when building an adjoining room you can merge three of the same rooms together to make a larger room which produces more & stores more of the resource.
I have two dwellers who I have equipped with the best armour/weapon to wonder the wasteland looking for loot. It is a fine balancing act of dwellers & resources to ensure you can easily manage your vault. My next target is to build another power plant to reduce the pressure on that resource.