If you keep them in a community pen (such as the one you are building) you should keep a minimum of 5 hens per male to keep the males from fighting. But I wouldn't put more than 7 or 8 hens tops per male or you'll likely suffer fertility issues.
If you feed them high-quality feed, hens can lay...
Oh boy...you're in for it now! Better get busy making 2 or 3 more pens that size once this one is finished...as you know, it only takes 4-10 weeks for them to start laying.
Coturnix quail are like Lay's potato chips....betcha can't have just one (pen)!!