[quote=@Zyx]
First and foremost, how do you build a fictional economy and do you even need to?
[/quote]

I don't think I can answer this question simply and I don't have time to attempt to go in depth so I'll have to give it my best.

Super simple answer:
No

But it depends on what you're doing. If it's a setting of just some dudes being dudes and the rest of society exists in the background then an economy is not that important. You *could* do an economy and declare at some point in the course of the RP all the prices at the shop are suddenly going up to represent some abstract world event. Or even if the RP becomes set in a town the entire town goes on lockdown for any reason and prices sky rocket like they do in Pathologic

[quote=@Zyx]
Second, do you need to create conlangs or can you just reference the fact that a character is speaking X language and leave it at that?
[/quote]

Not unless you're super autistic. You can otherwise get by by not mentioning it, or just ripping an entire RL language but renaming it the way say: Disco Elysium does.

[quote=@Zyx]
Third, is it possible to worldbuild a faction or civilization that has no culture? If so, what would that look like?
[/quote]

No. There is no such thing as a total absence of culture. Culture represents the totality of the relationship of a society to the material world, including the objective and subjective explanations a group of people have to explain the world (science and religion), and a whole host of historical relationships with themselves as a group and others and influences. A culture is the intermarriage of present material circumstances and the force of all history behind a group. If you were to create a group out of nothing and drop them into a world in which they have no context they *will* develop a culture unless they are some kind of animal, but even then it's known that some animals such as whales do develop something which can be called culture.

[quote=@Zyx]
Fourth, if your factions are run by gods then do you even need to go into depth on anything but the deity in question? And by deity I mean the omnipotent, can do anything that it pleases, kind. Not the Greek or Roman kind.
[/quote]

Depends on how much of a character they aree.

[quote=@Zyx]
Fifth, do you start fleshing out the world itself first, timeline of events, or both?
[/quote]

I start with the immediate physical environments and as I map them out I might create a summarized geologic history to explain features I am currently drawing onto a map and go from there while thinking about how and how much it matters someone else can *read* the intent of the map the way I did, or how I can enforce the intent of the map. Other considerations depend on various bits and pieces of set dressing (lore) and how much I want there to be. The rest is weaved in by others as they join and contribute.

[quote=@Zyx]
Sixth, how do you come up with names for things if you don't have a conlang? What generally goes into the creation of such names or their meanings?
[/quote]

See my answer to the conlang question. If no conlang: just rip of IRL languages and the general idea of how places are named or just vibe it out.

[quote=@Zyx]
Do you build dynamic worlds that are constantly evolving or stick with static ones that never change?
[/quote]

I've never dealt with anything of that scale of time.