Do a google search on Leopard Gecko breeding before you jump into this, it will be better for you and the geckos. Also, consider that 2 females in a season will produce from 6 to 22 eggs each, depending on size, age, etc. Be prepared to take care of up to 40 geckos. And if you think you can use the money from selling the babies to get rich, don't count on it! At best you may break even or turn a slight profit your first year, but that really depends on how much you invest into your breeding stock, and the demand for your offspring.
Breeding isn't something that should be gotten into without a lot of thought on the responsibilities and expense that come with producing all those babies.
And I don't mean to be condescending, but just the questions asked in your post tell me you haven't done a lot of homework on this.
The wet soil thing you referred to, that would be the lay box, it is used by the female to deposit her eggs, not for them to breed in, though they may breed in the lay box if that's where she is hiding. Most of my females don't make it ten steps in my males cage before he is on her, then she gets moved back into her own cage.
Hope this helped.
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Sam
Gecko Den
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