Where are you going to start these seeds. Do you have a light setup or cold frame to start them early. A window sill doesn't give enough light to grow good plants. Most seeds need a few weeks head start indoors before going outside after danger of frost is past.

If you don't have such a place look into the winter sowing forum. You will get help there and advice on what plants are good candidates for winter sowing.

Nasturtiums, lobelia, petunia, dwarf zinnias, swan river daisy and portulaca are all easily started from seed and would look good in a hanging basket

I did these last year, first time ever for me with flowers.
My wife spent $400 for hanging baskets that died.
She eventually took all of my nasturtiums and put them on the porch.
This year I am going to have them all over everything.
Started with grow lights in basement..
Beginners luck ????