I don't have seeds, but I have a couple ideas. If you want something just for this season, you might try mammoth sunflower seeds. They require quite a bit of water, but they make a tall, sturdy natural fence. In front of the basic mammoth sunflower picket fence you can fill in with other flowers for more privacy. There are other varieties of sunflowers such as maximillan which grow to 6' and are branching.
At the same time you can plant poplar trees. They grow quickly and in a few years you'll have a screen. They'll be beautiful for about 20 years.
Another longer term solution would be lilac bushes. I'm in Nebraska and they grow 12' high although it takes several years and they last a long time. They also bloom in the spring and smell like heaven.
Heidi

Hi Sharon
You might want to let people know what you have to trade with. :)
As you just moved there in Jan this is the perfect time to see whats all there. and don't think all weeds are "weeds" they cold be wildflowers you can collect seeds from to trade with this summer/fall. :)
I had to do the same thing down the bottom of my yard. I took Forsythia cutting's n stuck them along the bottom of my yard. took about 4 years for them to grow 5ft. and rooted pampas grass for a fast privacy fence.
The Sunflowers are a great idea. you could even put the large ones i the back and other varieties in the front. mix em up with other tall flowers too like cleomes.

Hi - I have the perennial rudbeckia herbstonne ['Autumn Sun'] that gets to 6' or so - very prolific and expands by runners. Butter yellow flowers w/ green eyes. What do you have in the way of flower seed? Doreen.