Here you go:
How many eggs can a female lay in one clutch?
Generally 2 eggs per clutch, though sometimes there is only one and on extremely rare occasions there could be 3
How many clutches can she have per year?
Anywhere from 1-10+
Also, what age should both genders of geckos be to start breeding?
I would say an absolute minimum of 9 months and 50 grams but others prefer to wait until 12-18 months
Is there a specific season?
Most leopard geckos seem to ovulate around Feb-August though some ovulate at other times.
Are females similar like dogs and go into heat?
They go through a several month period of ovulation at which time they often have appetite decline. They don't go through "heat" cycles like mammals and I don't think they give off pheromones or any other signs that they are ovulating. In my experience, the male doesn't really care whether or not they're ovulating. I have kept my male and females together for most of the year. After a brief winter separation, when I would introduce the males to the females (most of the females were not yet ovulating), the males would be very interested and this would continue until early to mid summer after which point the males would stop trying to mate. They are still together (pending separation when I have the room) and there is no mating behavior. It is important to note that, unlike mammals, the females store sperm, so one mating can be sufficient for the entire season's egg laying.
Are leopard geckos the same as bearded dragons in which will always lay dud eggs when of age?
I have found it extremely rare for leopard geckos to lay eggs when not introduced to a male (it's happened with only one of my leopard geckos since 2004). I have had only 2 female bearded dragons. One laid multiple clutches of eggs every year and the other, who I rescued with MBD, had reportedly laid a clutch with her previous owner, but mercifully has never laid eggs with me. She's about 10 years old and still going strong!
Aliza