Help! We're new at this and now we have eggs!

Okay we recently (less than two months ago) bought a pair of veiled chameleons. Now our female has laid 27 perfect round white eggs. We couldn't tell that there were any veins in them but all 27 were firm, bright white, and very plump. Everything I read says infertiles are yellow or miscolored and dented with no veins, so what does it mean if they're white and plump but we can't clearly see veins, likely to be fertile? We didn't think so because the one time we saw him try to mate she rejected him pretty harshly (bit him on the ribs) but the idiot we bought them from had actually been housing them together so it is possible breeding took place.

Also, our book is telling us to incubate them half buried in sand or perlite that is moist but not wet. It also said to incubate at mid 80's during the day and let it drop to mid 70's at night and to keep them in the dark. That's how we've set them up. Will this work okay if they are fertile?