I try to come up with a theme every now and then, like certain shapes incorporated into the rooms;
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my forts tend to be simple.
1. Dig into ground, make hallway(2 wide) at the end put stairs going down again, another hallway
2.deconstruct wagon, make stockpile for wood, build carpentry shop start turning out beds, chairs, tables
3.make 90 degree turn in entrance hall, build barracks so one wall boarders entrance hallway(later, it will be smoothed out and covered in arrowslits, so archers can defend the fortress without leaving the barracks
4. build ramp going back to -1zlevels, dig out biiiig room for farms. start farmin'
5. dig out area near farms for food stockpile, some shops(kitchen, still, butcher's shop)
6. construct intial workshop area, build mechanics shop and mason;s shop, forge, craftdwarf's workshop
7.get mechanic building mechanisms for traps. dig out channel for water supply, grate it off. sometimes turn it into waterfall within the fortress for happy dwarves. also begin making trade goods(mostly to get rid of excess rock)
8. begin building mega dining hall, with smooth walls and engravings.
after that, I start to dig my underground caravan road and build a trading depot. If I have a lot of wood and some immigrant peasants, I build crossbows and start my army. I build an archery range directly below the barracks. At this point, I also do whatever extra projects I feel like: underground refuse dump complete with ventellation shaft, statue garden on a cliff, ect. one time I dug into a cliff overlooking a river and started building apartments for my dwarves, but I lost that fort to a tantrum spiral caused by carp massecering half my fort, and make-work projects (stone stockpiles on the surface, anyone? no idle dwarves in this fort!) and trying to figure out how i'm going to kill my nobles/deal with all these freaking immigrants who only know how to cut gems.