As far as I know, the best thing with seed is to wait until the pod is fully ripe. Then remove the seeds and dry them out thoroughly. Some people recommend putting them in a jar with dry (heated and cooled) rice, but not actually touching the rice so it doesn't pick up any nasties from it. Other people think just air drying is OK. If you have a dry climate (Negev desert?) then air drying will work better for you than for me in cold and wet northern England. When they are fully dried out, put them into a sealed packet or jar and store them somewhere cool and dry. Keeping them in the fridge is OK but not freezer.
Did you isolate your plants or specific flowers when they were setting? If not, then they will probably have cross-pollinated and not come true from seed. You could end up with something even better or it could be poor. Pot luck.