Get on a gardening forum. I've joined several, but THIS is the one I keep reading and posting with.
TheEasyGarden - Gardening Forum
There, I am "ducks4you."
You should soak your seeds overnight before planting. Those that sink are variable. If they are floating the next morning, they won't grow. If you are using cheap seed packets they could be 3 years old. If so, soak for 3-5 days for viability. Use seed starting medium, and buy a couple of those cheap, plastic greenhouses. Seeds need to be kept moist, or they'll sprout and die. There are very vulnerable as seedlings.
Most hardware stores, especially have these things one sale in February. Look for the best buys on the last full week of the month.
I'm in zones 5b-6a.