Haven't actually done much of Fortress Mode in my two years of playing DF.
Just created a world using the Badlands template from the advanced generation page, so basically everything is scorching hot desert, there's no rain, no rivers, and only two civs. Also no surface vegetation.
Considering I can only play human outsiders and that fucking sucks, I'm making a fortress, finally. Gonna be lots of egg production, got a few guineafowl and blue peafowl. Peafowl for meat, guineafowl for eggs. Also some beekeeping. Wax crafts, honey for cooking, and mead.
So wish me luck. We're probably all gonna die.