Don't think in hard and fast rules of which types of tiles should get certain improvements. However, plains should mostly be worked last - improve floodplains and grassland first, unless we're talking about a resource, of course. Food is king and plains lose out here. The same applies for hills.
I had a look at your save.
You should be running your slider at 100% as often as possible. You have enough gold to get Alphabet in 8 turns rather than 10 (at your current rate), so go for it.
Two workers (I know you have a third coming up) isn't enough at this point. You need one or two more for now, especially since you're a bit behind on improvements.
Make sure you chop grassland riverside forests first before plains ones.
Lyons went warrior first? Don't do that in a new city, but instead prioritize infrastructure. Existing cities should supply military units. You also don't need to keep two warriors there.
When looking for spots to settle new cities, make it a goal that every food resource around you is workable by at least one city.
I don't see too many good city sites because it appears that you're a little boxed in and the open area to your northwest is very subpar. I would say try dropping a city 1NW/1W/1SW of the pigs between Pacal and Wang, because either one of them is likely to settle it soon and you want to grab it first. Backfilling can always be done later. I can't tell what's in the fog, so it's hard to say which spot is the best.
Another possible city location is 2S of the clams, but that's not a big priority right now. There's also corn to the south of you, but with all the tundra down there, that spot can wait. It's still worth settling eventually, though.
You have two warriors quite far to the west (one fortified, why?), but none to the east which you have barely explored. Swing one east and the other one south. Your early scouting should have the primary goal of finding new city sites to settle - you shouldn't be wandering too far from the capital in order to do this, but instead try to circle around it.
Wang has a very, very strong capital, holy cow. Double gems? Horses? Wet corn? Elephants? Sheesh! If you can find horses, copper or iron, you could plan a war against him soonish.
I had a look at your save.
You should be running your slider at 100% as often as possible. You have enough gold to get Alphabet in 8 turns rather than 10 (at your current rate), so go for it.
Two workers (I know you have a third coming up) isn't enough at this point. You need one or two more for now, especially since you're a bit behind on improvements.
Make sure you chop grassland riverside forests first before plains ones.
Lyons went warrior first? Don't do that in a new city, but instead prioritize infrastructure. Existing cities should supply military units. You also don't need to keep two warriors there.
When looking for spots to settle new cities, make it a goal that every food resource around you is workable by at least one city.
I don't see too many good city sites because it appears that you're a little boxed in and the open area to your northwest is very subpar. I would say try dropping a city 1NW/1W/1SW of the pigs between Pacal and Wang, because either one of them is likely to settle it soon and you want to grab it first. Backfilling can always be done later. I can't tell what's in the fog, so it's hard to say which spot is the best.
Another possible city location is 2S of the clams, but that's not a big priority right now. There's also corn to the south of you, but with all the tundra down there, that spot can wait. It's still worth settling eventually, though.
You have two warriors quite far to the west (one fortified, why?), but none to the east which you have barely explored. Swing one east and the other one south. Your early scouting should have the primary goal of finding new city sites to settle - you shouldn't be wandering too far from the capital in order to do this, but instead try to circle around it.
Wang has a very, very strong capital, holy cow. Double gems? Horses? Wet corn? Elephants? Sheesh! If you can find horses, copper or iron, you could plan a war against him soonish.