Worker - worker - settler
used to be possibly the strongest strategy. Then they nerfed chop hammers from 30
to 20
per tree chopped; now it's one of the weaker ones generally.
The right opening is situational, but here's some guidelines I would give.
-Never go settler-first unless you're Imperialistic, and usually not even then.
-Never go warrior first unless (a) your starting worker would have literally nothing to do, (b) you're planning on worker-stealing, or (c) you're planning on warrior rushing someone.
-Worker-first should be your default; it's generally the right move.
After you have your worker, you usually want to grow your city a bit. Whether you grow to size 2, 3, or 4 is going to depend on the tiles your city has available - with 3 corn and a copper, you probably grow to size 4. With a plainscow and a dry rice, you'll be expanding earlier because growing will just take too long. The simplest choice is to just build warriors until you hit the size you want, then immediately switch to your next build. If you're planning an axe rush or a chariot rush, this is also a chance to start work on a barracks which you'll finish after you get the settler out. You usually don't need a second worker before your settler if you've taken the time to improve some tiles and grow your city a bit first. But if you're an IMP leader, you might want the extra chops so you can get the hammer multiplier going towards the settler instead of spending the chops on a worker.
Probably the most common opening for me is worker - warriors (to size 3) - settler - worker, or worker - warriors (to size 4) - settler - worker.
Opening worker-worker is only worth considering on heavily-forested starts in which your capital has just one or two good tiles to work, and a lot of average or bad ones.
Worker-settler is worth considering only if you're really desperate to get a specific city site - if your starting warrior scout reveals something truly alarming about the map which indicates you might have to do that. Even then you often want to grow to size-2 first.
Coastal starts throw all bets off; they're complicated. When and how many fishing boats you get is going to depend a lot on what other tiles and what techs you have; that in turn impacts when you get your workers, warriors, and settlers. Maybe someone who doesn't regularly mess them up (like I do) could give you more detailed advice.
Oh - and welcome to the forums!