I am currently growing goji berries from seed. I took a few hundred seeds from dried and then re-hydrated berries and placed them in a zip-lock bag with a moist paper towel. The seeds don't have an extremely high germination rate, so I picked out the seeds that started to sprout and placed them in little cells with potting mix.
Last year I used a similar method but only used roughly 20 seeds and got 3 strong plants, two of which did not survive due to rabbits or squirrels. Of the 40 or so seedlings, I am hoping to have at least 20 tough survivors.