wrong section to ask, you should try over the general section. But anyway, pretty much have 3 females to 1 male guppy and you should have a few pregnant guppies in a few weeks. Its very simple, I used to cluster breed small platy's until I just fed beef heart for the protien part of the diet. Just put some sort of plant in there for when the females are ready to give birth, remembering that they are live bearers. The other option is to buy a small breeding trap where the fry can slip through the gaps in it, into the main or other tank. But if the mother does pop out some fry she may be exhausted and hungry so she may want to eat them herself, thus the reason for a breeding trap.
hopefully this info is helpful. but breeding live bearers is quite simple. chuck them in and they'll churn them out, under the right conditions I may add. which is the filtering and heater req. etc.