Here is my typical strategy, build a worker/fish boat in your initial city to improve the tiles, then send out settler parties until your science rate hits 60%. Each new city build a worker first, which is then used to chop obelisk, cottage spam and chop court house (but leave some plain forests around for lumber mills later on). The great library is an important wonder, so beeline for literature, and chop it out fast. After that, code of law should be your priority if you don't have it. Of course, if an opponent is close by at the start, I might forego settling a third city, instead chop out 8 axes and grab cities from the AI. Granary, barracks, courthouses, and lighthouses (only in food poor location) are necessary buildings in your non-capital cities, so build/chop/slave out, but build armies in your high production cities. If in doubt, build more soldiers, that way, your power remains strong (less likely to get attacked), and you always have options of attacking AI if the need arises.