Questhelper in 3.3.5a

Played all the way back in the WotLK days and decided to pick it up again. Boy, I did not realize just how much time has passed since those days and there’s an overwhelming amount of content.
I have lots of comments/questions… I’ve read a good amount and watched some videos but it seems like a lot is already outdated.
Dragonflight:

1. Is there a fast way max renown?
2. After you’ve done the campaign on one character, can you skip it on the others?
3. Any must-dos at this point? Anything that shouldn’t be missed or adds a lot of QoL or is locked behind quests?
4. Fast ways to decently gear before tackling Mythics (which didn’t even exist when I last played…) or raids?
5. Professions used to be… a lot more straight forward. But they were also important for specific perks to buff your characters. 5a) Is that still the case? Or are the perks available to everyone now and professions are mostly to make money? 6) What are the current go to addons? I feel like before you really only needed DBM, Healbot, and Questhelper.

Pre-DF expansions:

1. Is there any benefit to completing prior campaigns outside of catching up on lore? Certain raids or otherwise locked by completion of those campaigns?
2. Any benefit for the Garrison/Shipyard other than just for fun? 2a) Any particular “best” buildings, followers, etc.? 2b) Are the level 3 building achievements a pain? 2c) Since the followers are capped, do you just drop the common followers? 2d) Is there a fast way to farm garrison resources?
3. What are the “best” or unique parts to each expansion (such as the Garrison/Shipyard for WoD as an example)?
4. Is Shadowlands flying really as annoying as it seems to unlock? I got to 60 well before completing the campaign but kept pushing because I assumed I was close… ended up getting to the point where I had to pick a covenant I chose the Night Fae covenant (I read you can switch later so didn’t put too much stock in it. Which leads to some more questions… 4a) Unlocked the Sanctum, additional mission-like area similar to the Garrison. Do other covenants get a similar type of base with upgrades? 4b) How painful is it to max renown? It seems like you’re sorta time locked because I get to the tier 5 jailer threat and rep gets locked. 5) After you’ve completed the main campaigns, whether it be for Shadowlands, WoD, or others… can you skip it on alts?

Thank you!

Title.
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I get errors when I try using Questhelper on a 3.3.5a server. Project Ascension. I downloaded the correct version and even tried editing the check for private servers.
Says its broken and stays at 1% loading.
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msg: Interface\AddOns\QuestHelper\manager_achievement.lua:166: table index is nil
toc: 1.4.1
v: 1.4.1
game: 3.3.5
locale: enUS
timestamp: 2019-02-08 17:17:38
mutation: nil
silent: false
(Coroutine error in preinit)

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Or does anyone use Carbonite? Any way to make it not totally hideous? Seems to really be ugly and clunky but I don't know if it's just default settings or something.