I've started doing this with my initial 7 dwarves. And the first 1-2 migrant waves Any dwarf who isn't a hunter / miner / wood cutter gets drafted into a militia. So my first two squads (20 dwarves) are my militia.
Schedule: Inactive year-round, using the (x) command in the schedule menu.
Supplies: I only let them carry drink, not food.
Ammo: Hunters get assigned ammo types (500 wood and 500 bone bolts), militia gets wood bolts only to start.
Things you'll need to make:
- Crossbows for everyone
- 1500+ Bolts, wood bolts are good enough to start (each log makes a stack of 25)
- Quivers (from leather, or the fall caravan)
- Flasks / waterskins (somewhat optional)
Uniform: Set to go "over" clothing, with exact matching
(1) crossbow
(1) iron mail shirt
(1) iron cap
(1) iron chain leggings
(1) iron high/low boots
(1) iron buckler
At least, I think "over" works for those items. I don't even make the iron stuff until my 2nd fall, it's enough that they're walking around with the crossbow, quiver and bolts. I figure mail shirts, boots, gauntlets and bucklers will be first off the forges. They'll take what they can get, when they get it.
It is indeed high amusement when a kobold thief gets spotted and pin-cushioned by all the haulers / farmers / masons / mechanics.
Even when their schedule is set to inactive, with "no scheduled order", you *will* see them train at archery targets.
.W..........#...
.WA########D#...
.W..........#...
.WA########D#...
.W..........#...
.WA########D#...
.W..........#...
"." open air, "A" archery target
"#" floor, "W" wall, "D" dwarf
In the above diagram, the archery targets are placed on a raised walkway with a wall running the length of the room. Dwarves stand on the walkways and shoot right-to-left. Any bolts that miss the target will hit the wall and drop to the Z-level below because it's open air. That will let you recycle bolts early on when the dwarves are not that adept at shooting the target. The longer you make the walkways (10 tiles is probably a good minimum) the better, because they'll miss more.