breeding ocellated skinks (long post-sorry!)

Hi, I'm new here and would appreciate a little advice. My daughter has just bought a breeding colony of these beautiful little skinks. We did a google search prior to her buying them, but could not find any info on breeding. We had them from a shop that did not breed themselves, so did not really know much about them. We have two large adults, one of which appears to be male ( distinct eyes and large head) one smaller adult, 4 juveniles and 2 youngsters. The shop has observed mating. Last night the big 'male' was sort of tail shaking at one of the others. Is this agression or mating behaviour? Also does anyone know
1) gestation period
2) how to tell a female is gravid or about to give birth
3) what kind of environment she needs to give birth in (?wet box etc?)

Any help would be appreciated.