Oh wow. You do play a lot of this game.
You will run into many, many bugs the more you play. Be prepared. Some really annoying ones I experience daily prevent me from fast traveling, trading, teaming up, or even just joining the same server my GF is on.
The leveling is pretty terribly designed, they've already altered it once but are doing a major overhaul later this year. Many places the level is set by the first person to enter the area, so any high level player like me will always set the level to the location's highest. Keep that in mind. The Forest area is the only exception, everything there is pretty low level and can't be raised by a high level player in the area. Other areas are always high level, such as the Cranberry Bog.
You can hotkey your weapons (and other items) in two ways, directly from the pipboy or from the wheel itself. If you do it from the pipboy, you pres RB and it will add them to the wheel clockwise starting at the 1:00 position skipping any already keyed. If you press up on the Dpad to open the wheel you can move to a specific slot with the Dpad or one of the thumbsticks (I forget which because I always use the Dpad, or more specifically the two paddles I have set to the Dpad) and press RB to open a menu that shows you every thing you can put there, which could be a lot if you're holding a bunch of stuff. Left on the Dpad just cycles between the last two selected weapons. Dpad right is a dedicated stimpack key, so you don't necessarily need to hotkey one unless you want a specific type to be used. It defaults to the lowest one first, so Diluted, then regular when you are out of diluted, and finally Super. Healing Salve sometimes gets used before any stimpacks, but when I used them over a year ago it was hit and miss that they got used.
Be sure you have Pacifist mode on in the settings, otherwise anyone you accidentally hit will be able to kill you and take your dropped junk. Workshops override Pacifist mode, so if you take one over anyone can kill you inside the build radius, possibly even away from it if they have a teammate contest the workshop for them. If you place your camp in a popular spot (you did, that's a popular spot) and somebody else has theirs or their Fallout 1st tent near enough, your camp can't be placed. It should warn you though and give you the option to switch servers until you find one where your camp is placed. All my camps are on popular resource nodes, so I frequently have to switch multiple times before I can have my camp available. I hate camp building too, that's why I let my GF who enjoys it (except when Bethesda's stupid bugs piss her off like they are right now as she is rebuilding another camp for me as I type this) build all of mine. One thing a camp will help you with is caps. Once you find out what people want, you can start selling stuff from vending machines and make a lot of caps. I sell popular junk all the time, stimpacks, 5.56 ammo, and rare cosmetic items. I can make 10,000 caps in a few minutes with the right stuff for sale. Depends on who is on the server though, that same stuff could sit there for hours and not make me a single cap. MMO's do it better.
Atom Shop was promised to be Cosmetic only at launch, but that was one of many lies Bethesda has made about 76. They now sell scrap kits that break down all your junk and teleport it to your stash, repair kits that allow you to repair weapons and armor anywhere, and collectrons that can collect junk or food (depending one which one you get) for you at your camp. I'm also betting they will start selling the upcoming lunch boxes that give various buffs with the update Tuesday. I started out just buying skins for Power Armor, but branched out and now have many camp items and a few cosmetic items for my two characters that don't wear PA. I earned a crap ton of Atoms for free since launch though doing 98% of the Challenges they have in the challenge menu (which is only visible if you are on a server, not the main menu), as well as all the daily and weekly challenges they list there, and never bought any unless you count the monthly atoms I get for my Fallout 1st sub. I'm also a Cheap Ass (no surprise) so I frequently only buy things on sale, usually 50% off. From what I've read, the daily and weekly challenges are getting removed on Tuesday, and the amount we will earn in this Summer season is only about 20% of what we would have been able to earn from all the daily and weekly ones. So if you want to buy anything, I suggest you do them if you can. Items cycle through every week, and some weeks they have a few things only available for a day, or at least at a discounted price. This week it looks like two new things are added/removed each day on sale, not including all the stuff that is available on sale for a week and a half.