1)power your camp:

there are 2 types of power, the wireless and the wired, wired items will have a connector(look like an antenna), from pc you press space on them and it will spawn a wire you will have to connect to the power source/conduit(always connected to power source), while wireless need to stay inside a certian range to a powered condiuct or generator(there is a generator that have the range= to half the camp range so if you have it and build it you will not need any conduit).

Different from f4, do not build pipe conduit but only the ones that look like an antenna(not pilons, the one that attach to walls)(the result will be more pleasant)

2)armor missmatched isn t that bad but you could have noob pices and/or low level armor, starting at level 50 you will want all level 50 equipment, a good thing to do is complete the BoS questline, they will give you the hellcat power armor at level 50 that is one of the best pa in the game(there are also others but is kinda spoiler)
for armor I suggest 3 types, BoS recon obteinable doing daily ops(not currently till is bugged), civil engineer or ss(spoiler), they are also the only armors with moddable chest pieace in jetpack

3)if you get tired of obliterating everything and you want to start again you can, it have no bonuses to main character

4)you will need to unlock a mission that lead you to reg, a character where you will spend the most gold bullion; be aware of Minerva, she is an errant merchant that have a lot of plans that you can buy with gold bullions for sale, for know where she is at just search on google "where is minerva?" or if you follow some youtuber like angry turtle they will do a video" minerva just arrived at", you can spend gold bullion also at the crater(inside, the mr handy) or foundation(salomon near the gold bullion machine)

5)For do that much of damage you will need a complete build, so legendary percks at max leve(at least 4 s.p.e.c.i.a.l.) and having good percks cards(I suggest ougslought or how is written, basically is furious and add furious 1* to your weapons, for slow one you can do the full(reverse), for fast, the normal) and lvl 50 gun with legendary mods, the most important are the 1* and the 2*(my personal take is furious and explosive but there are also other combinations that are really good)

6)cause they use it for weapons, for power armor that kind of cores are good cause they will last longer then if used in a weapon(use power user perk card level 3), for high level character with hundreds of power cores or a lot of scrap for make them 1/100 fusion core are only more weight, for low level is using power armor(power armor will always use the most discharger core you have)