Postage scales from Staples are all you need to weigh out herbs. They are pretty inexpensive. That being said, if you can find the herbs locally, you could start giving them separately. Exact doses depend on the nature of the product. You might want to base your dose on what a 120# human is supposed to get of each, per the manufacturers directions.
Note that HSA Compound, which ATTH may have in stock, has everything already added. If they are out of stock, they will be back in stock by the beginning of next week, if not before
Hope that helps