Hold right mouse button and move the mouse, to pan camera in cc.
+ Means higher value, and - means lower value then what you currently have equipped, multiple + or minus means a bigger difference. The shield is physical protection, the lightning is energy weapon resistance, and the radioactive is radiation resistance, and there's also poison resistance.
The quest from the elvis dude will tell you what you need to build in the settlement, you don't need to build any new buildings or anything just items. You don't need to scrap any loot you find, scrapping is just done on junk buildings and dead trees that lie around that you can't pick up and can't build or move in the build mode. All junk items can be stored in workshop with the store all function and will be broken down automatically when needed.
Weapons and armor i am unsure how work. I know you can store them in the workshop, but i am unsure if they wiil be auto scrapped like junk does. but since they can be scrapped into better parts with the right perks i have decided to just store them in there own container until i get those perks. And i have a feeling i will be selling a lot of my spare armor/weapons.
*You cannot scrap anything in the workshop because it is not needed. If you for some reason wanna scrap armor or weapons keep them in inventory and use the crafting stations, when you select a weapon or armor you get the option to scrap it, but like i said above, unless you have the perks they will not scrap into anything worthwhile, so you are just throwing money away. The exception might be leather armor cause i have't found much junk that gives leather.