To late to plant them with the method I used when I was still able to grow my own. I follow what Curt Hanson, Dottie Warrell and others do.
When I harvest seed, I let it sit out for a few days, then put in small paper envelopes that I leave the end open, so it is not sealed. I store the envelopes in a box, on a bookshelf until end of October. I plant them outdoors, in prepared beds. I put them about half inch apart, about a half inch deep. Then forget them until spring, when you will see them coming up. When they are several inches tall, they get transplanted to be a few inches apart. There they grow until they bloom.
It is true that some will sprout in the fall, as soon as they are planted, but it was explained to me that those are seeds that would grow up to be evergreens, so you don't want them anyway. I still had very good germination.
It is the no muss, no fuss way to start seeds. I have had them dry on a shelf for 2 years and still had 75% germinate.