Like others, I try to get my base dug out with the first 7 as well as attempting establish the core of my fort (military, leadership, health care, & food).
2 Military (Both with points in teacher and student as well as combat skills; squad leader gets high ax skill, the other gets medium armor and dodge skill.)
2 Growers (Each doubling as either a Cook or a Brewer.)
1 Noble (Bookkeeper, Leader, Manager, Trader, etc.; starts with social skills to insure promotion to higher positions.)
1 Craft (Mason, Mechanic, Building Designer, & Carpenter.)
1 Doctor (Maxed Diagnostician & other skills.)
I start with 2 training axes and 5 picks. The military guys are ax dwarfs, so they cut down trees. The rest dig out my base. The base is usually finished being dug out by the first or second migrant wave and then everyone starts dumping stone while the craft dwarf makes bridges, floodgates, mechanisms, and hooks everything up so I can start farming. The Military guys start training while the growers start growing. Then I make beds, barrels, and bins while I look for iron deposits to begin making trap components and steel battle axes. After that I dig out my pit trap and set it up while I conscript more migrants to my army. At this point I'm all set up so I get to start working on large scale projects while I wait for sieges.