As far as I.I'm aware you are already too late if you are hoping for flowers this year. I would get a reasonable amount of seeding compost in a seed tray. Scatter your seed over it , water it and cover it with a bit of cling film. Sit it on a south facing windows sill until germination takes place. Don't over water as the condensation created will be sufficient. When the seedling are through remove the cling film and don't let the compost dry out. When the seedlings are big enough to handle, I would pot them on into 3" pots. When all signs of frost have passed, harden them off by putting them outside for a few hours each day.
Plant them out when they are 5-6" tall. If any flowers heads arrive, just cut them off..Starting them as late as this means you will be getting stronger flowers next year.
My wife started some from seed last September, she now has around 50 or more, ranging from 2-4" tall. They are indoors in pots.