After the Tutorial put all dwellers in the room they are best at,( #Specials). Put power rooms in between the diner and the water treatment so both rooms get lots of power. Once you get your first gun give it to your best dweller who has alot of endurance, then send him to the wasteland and check on him every 30 minutes.
Give all of your outfits to the dwellers that it will help the most like for example give military fatigues to dwellers in the power room, it will speed up the time power takes to be made. Thats just an example, much more outfits for diffrent things.
Ok now pets, your first pet will probably be a basic pet like a poodle. Give pets to whoever you want except dwellers that are overpowered but that wont happen for a while.

Put S in Power room (strength)
Put P in Water treatment (perception)
Put E in Nukacola Factory (endurance)
Put C in Living Quarters (charisma)
Put I in Medbay and Lab (intelligence)
Put A in Diner (agility)
Put L in Everywhere (luck)

Put Two dwellers at the Door that have Good Guns

When you run out of space for things, build a storage room for more stuff. Upgrade, build or expand the storage rooms as you need more space. Storage rooms do not require dwellers to run it.

Getting Dwellers is simple Either LunchBox Putting A male and female in the same living quarters or a radio studio but be careful because deathclaws maybe will want to visit you and kill you also quests will maybe give you dwellers

Getting caps is fairly easy.
To get caps leveling dwellers is one way or doing quests.
LunchBoxes also can give caps.
Luck will make dwellers randomly get caps.
Collecting in the wasteland is a way as well.
Sometimes there is a mysterious man dressed all in brown, you have to click on him to get the caps.

Raiders are the first enemies to encounter, they are in groups of three and have weak guns. Always have at least one dweller at the door.

Ghouls are deadly and always come in huge groups, they will irradiate your dwellers. Always have two dwellers at the gate and have lots of Radaway.

Deathclaws are very deadly, keep watch of your dwellers, they also come to hunt in groups of 3. They can kill dwellers in seconds and they can easily destroy your power. Watch out!

Anyways i hope that helps and that you will survive tell me any mistakes and i will fix it bye