i dig down first, then wall the area off, creating protected trade depot.
living quarters are shared at the first couple of years, then i would start building a tower above ground, consisting mainly personal quarters, dining rooms, and grand meeting hall.
the underground part is extented for industry and storage. though some portion of the industry and stockpile is located in the less than top levels of the tower.
the top levels are reserved for the monarch, when it comes.
tombs are dug seperately in another location, near the main fort, with a smaller tower rising into sky, while most of its structure lie underground.
above ground farm is eventually sealed with obsidian ceiling, next to underground farms and argricultural workshops and seed, plant and unprepared food goods stockpile.
army is made up from mainly crossbowdwarves, defending the tower from the outer walls, as well as the fortification on the brim of the tower.
if they dont manage to kill every enemy before they reach the gate, a deep drop pit would serve the purpouse, in case i'm not willing to use cage trap.
oh, embark.
i usually embark on quare place from 4X4 to 6X6, anything larger would not do any good. unless i need a larger embark site to get all desiring elements, i.e. river, flux, soil, sand, metal and clay in case of .19.
i prefer argriculture and steel industry over the others. textile used to be my favourite, but it's much undervalued at the moment, since economy is turned off. in .19 it means i need to be more sensitive about grazer, in order to gather enough food and ensure variety, aside from exploiting huge farms. and so far food industry has satisfied, not only mantains my dwarves, also ensures huge amount of exports. my forts were renowned for their fine cuisine and tonnes of exports every year. only goblins needed to starve.