Making seeds
When your male plants burst their pollen in your grow room they will pollinate the female flowers. At the end of flowering the bud will contain seeds. The seeds should be grayish in color. If they are white, then they are not viable and you harvested them too early. Wait until the end of flowering to get your seeds. Your seeds will be in with the bud. It takes quite a bit of time to sort them out from the bud. If you want to use the seeds in more than 2 years time store them in a freezer. Before that time storing them in a small film canister will work well enough.