Hmm... AntsCanada seems to have removed it from their site.
Mixing sand with clay makes a more stable mix, less prone to collapses. You will have to keep it slightly damp (if you see any condensation, then it is fine). It is easier to completely dry out the clay and sand, grind the clay up until it is sand sized. Mix the clay and sand together, add them to the farm and then add water.
Workers can be interesting to watch dig. If there is no queen or brood they probably won't do much after digging a safety tunnel. Workers are a good start to ant keeping though, and a way to keep impatieence away as you wait for a newly caught queen to raise her first workers.
If you just want workers, find a large ant nest and collect workers only from it. Workers from different nests will fight.
A seperate outworld will make it much easier to feed and clean up after your ants. I like to have a waterer full of sugar water or hummingbird nectar for the ants in their outworld (http://forum.formicu...-liquid-feeder/).
PS. The first queen flights start in May