Gary, honestly I've never had any luck with them and I can grow onions.
My best suggestion is go with an onion that does well in your area; local feed stores probably carry the onion that does well in your zone.
That being said, I can't grow 1015's/Texas Sweets to save my soul. I grow an intermediate day hybrid called Candy. I've actually been able to cure and hold through January after May/June/July harvesting. Pm me, because right now I can't find the people I buy from at my fingertips.
The rules say, plant and make a furrow of nitrogen in between. Mine are planted in raised beds, about 1 inch deep for starts. My beds have massive amounts of compost. The beds are heavily tilled with blood meal and massive amounts of bone meal. I interplant with stuff that I don't care about, anything that sprouts fast and shades. Lettuces/Spinach/Chard works well. I'm not concerned with getting crops from them, just need the shade to keep out the weeds. Actually I broad cast those seeds before I plant the onions.
The beginning onions need nitrogen, quite a bit. When the tops at my house are at least 6 inches tall, I start adding stuff that bulbs need (phosphorus) and cut way back on the nitrogen. Too much N, makes them hot and they don't bulb well.
They must be weeded and watered regularly. Onions, need regular water, otherwise they will bolt. If they bolt; start sending up flowers, pull and learn to can.
Make sure your bed is tilled well, no stones...don't over till.