I used to have a native plant nursery here in Alpine. I would offer the following from that experience:
Many perennials (and most of the herbs are perennials) propagate more easily via cuttings than by seed. They then become full-grown plants more reliably than seeds, but not a whole lot faster than seeds (a few weeks is normally the maximum you save in terms of time). Plants are more expensive than seeds, so how soon you need to have a mature producing medicinal herb garden may be an important variable in making decisions about buying plants v. buying seed.
Many herbs grow wild here and can be counted on to grow well from seed (if you have seen a field of it on the hills, try it from seed, first).
Some of us will be experimenting (I will, I know) at propagating plants from cuttings. I will offer a workshop showing how to do that if this is a new skill for you. The trick is usually the kind of potting soil used and having shade available for even the hardiest plants for a portion of each day while they are little. Plus a good organic foliar fertilizer (sprayed on the leaves of your little plants). Locally propagated plants would be much less costly than those shipped in from some other place.
I will post what plants I have available as soon as I have them. I am hoping others will do the same.
Eve