As Hdyz says Lv77 could be a good level to start with since you are able to get 280% or even 310% flying mounts, for Herb and vein farming. There's good money in it.
I should note to you, since alot are farming such, you should instead run for Silver, Gold, Truesilver and other herbs from STV, those will usual sell for more, since no one is farming them anymore?
On my server copper ores goes for 20g/stack, and truesilver even goes for 200g/stack.