I've not read every word in the thread, but most of them. All are coming from reasonable, sound perspectives. Just for what its worth, let me throw mine out there also.
As some have hinted at, the more you plant now, the more you will have available at first harvest. However, consider this. By planting wild simulated, you will be harvesting wild roots. Therefore, you want/need to be very selective in your harvest. So one pound planted does not necessarily equal 1 lb + growth - losses in ten years. If you can do so without raking, I have always encouraged folks to go back over a planted area in about two years and replant it. By about year four, you will start seeing some berries and the patch will start to reseed itself naturally. By reseeding the same patch we are adding intermediate age classes and filling in the bare spots too. If your initial planting was sort of sparse (maybe a seed or three every 8-16\") There is plenty room for more plants. By around the 8th year, you should be seeing a very healthy, naturally reproducing patch of, for all intents and purposes, wild ginseng.
When you harvest, be sure to only carefully harvest the largest plants. If they are not large in size, it is better to let them stay in the ground a while longer. There is no real downside other than time. They get bigger, older, more valuable, and continue to produce seed and tops (if you collect the tops).
Now, with that being said, the sooner you get those seeds in the ground the sooner you will have more premium roots to harvest.
The caution of the others who posted are sound. That is a lot of seed for someone who isn't experienced. But, if you have the will to get it done and a method mapped out, 4-6 pounds isn't really too much to plant -although it will be expensive as seeds go. Based on my experience, I might suggest you plant 4 pounds now and another 2 in a couple years. Perhaps you will want to plant all 6 now and plan on more investment each year.
Remember, age is the key to ginseng. The longer it is in the ground the better it will be. Your job is to figure out how old you want to be when you start harvesting quantities.