1. if you're playing a competitive game, next to other civ(s), on higher difficulties, having raging barbs option on, playing against 1 or many good human player(s), and/or having agressive ai option on, THAN u probably want/need to build warriorS and/or palisade building.
2. if not in #1 's situation(s), have more and/or useful land tiles/resources than water tiles/resources, and able to build land improvments or be able to before u build your worker, THAN build a worker first.
3A. if not in #1 's situation(s), have more and/or useful water tiles/resources than land tiles/resources, and able to build water improvments, THAN build a work boat first.
3B. if not in #1 's situation(s), have more and/or useful water tiles/resources than land tiles/resources, but can't build work boats (no fishing tech), THAN build a quick building, warrior/scout, or worker.
4. tech wise, u wanna get what u need (if u don't already have the tech) for #1-3 's situation(s).
4A. for #1, u wanna get either military techs (for better military units) and/or mysticism (for god king civic and elder council for beakers and faster techs and scientist specialist for more beakers, faster tech, and great sages for academy first than used/made into a super specialst in city for more beakers and faster techs). mysticism usually should be gotten first before going for military techs (unless u must/need to get military techs/2nd tier military unit ASAP), if your going to get both of them.
4B. for #2, u wanna get agriculture (for farms)
4C1. for #3B, u wanna get fishing tech so u can than build the fishing boats and get the water resources.
4C2. for #3A, u wanna than get sailing tech (for whale resource improvement, harbor buildings and ocean trade/trade routes).
5. after #4, for tech, u wanna get mining (for mines and/or towards axemen) or calender (for plantation or towards festical tech and its market building for +3 gold) or animal husbandry (for pastures and/or towards horseback riding) or sailing (for whale improvement and/or better naval units or buildings/wonders) or hunting (for camps or hunters) or the tech (forgot which tech) that gives u library building or whatever tech that gives u buildings or civics that grant u more specialists or whatever tech u need/want.
6. for #1 situations and after #4A, for tech, u wanna get the tech that gives u the library building for another sage specialist OR u wanna get the tech(s) that gives u building(s) that give u more priest specialists.
7A. for NON-#1 situations and after #3, u wanna use your farms-food to REX (rapid expansion) (spam workers/settlers until u can't or need/want to switch focus on other things)
7B. for #1 situations and after #4A, u wanna build the library building soon as u get the tech for it OR build the pagan temple and other buildings (when u get the tech for them) that give u more priest specialists.