Setup? Wait, hold on.
Go into "embark_profiles" and paste that in there. If you want. It's a very simple setup I use for rapid entrenchment. I've taken the liberty of removing the stepladder, charcoal, and chickens. The stepladder is useless in the desert, the charcoal is only useful if you embark with coal, and not everyone wants chickens.
Also, I do deserts all the time. Love those desert embarks. Glass is very easy to make and makes for decently effective traps. Max savagery too please, if you want.
As a side note, I thought dragons could already fly?