They should be dried quickly in a dry and warm (not hot) place, if done correctly they should fully dried in 3-5 days.
A tincture is extracted and bypasses the digestive system, powders have to be digested.
Freshly ground powder.
The seeds are not used as medicine.
Not sure what you are looking for, but the materia medica sheet you will get when we cover this herb, is rather extensive.