Gargs are far more solitary than cresties are, so their own enclosures are a great idea. I intend to rotate my male between the females this season and then at the end when I take him out for the winter he'll have his own enclosure. This will give both girls a much needed break.
If the female was May 08 then she probably shouldn't be bred until next season anyway. Technically you could pair them up around November/December but then that makes no sense as it's the cooler months anyway. So I'd just wait until the spring and pair them up in February or March... if you do decide to breed them.
Their care is so similar to cresties. The only thing they need is a bit more protein in their diets. I offer my adult gargs dusted crickets 2 to 3 times a week where adult cresties only get them 1 to 2 times. That's about it... Some people also say that gargs will more actively use a basking spot if provided with one. But this can be tricky because you don't want them to overheat. Those 13w incandescent aquarium lights (cheaper than the 'reptile' version by far!) probably do the trick just fine.