If you provide apt housing, breeding is easy.
You should hibernate them properly and then within a few weeks after the hibernation you will see lots of matings and get the first clutch around april.
Hatching rate depends a lot on health and supplementation of the mother. One to three more clutches will follow during summer.
Sometimes you may have to remove the male for a while, since too much mating stresses the female. In some cases you may add a second female-but no all females do tolerate other females.

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Ingo