HI Francine i would use a very small sifter or paint strainer would be even better since the seeds will be very small then mash some of the berries with your fingers while running water over them then use tweezers to pick out the seeds.then set them up to dry for a few days. then just put them in a paper envelope and mark them.when spring gets here just plant them in a flat and just barely cover them with soil.and keep them wet till they come up.then you can transplant them where you would like them to grow.hope this helps and good luck with your seeds.your friend in gardening.mike57