There are a lot of seed banks that you can find on google that will send to US, just gotta search. Here are just a few that I found under a minute.
http://www.dutch-passion.nl/ http://www.buydutchseeds.com/default.php http://www.77seeds.com/ http://www.seeds-cannabis.com/default.php http://www.420-seeds.com/
How many lights you need and how many watts that is required depends on the size of your grow room. The idea is you want as high of wattage as possible, the only real factor stopping highest wattage possible is heat. Of couse you can combat heat issues with air exchange and circulation. But a general rule is 50 watts per square foot.
If your getting air cooled lights, get good fans. Quality inline or centrifugal fans are well worth the investment.
If your going soil, I recommend the best quality organic soil you can find. And if you can, add in some compost to your soil mix. Your plants will love it. Also, if you got the extra $ to spend. Buy some vermiculite and perlite to add to your soil.
Smallest pot you want to grow in is 3 gallons when using soil. If you can, go straight for the 5 gallon.
Astral