TBH there's no way any of us can tell you the best/fastest way because 99% chance you're on a different realm and most likely the market is different. I'm on a high pop server and Im not kidding you i have 12 bank tabs full of Twilight Jasmine/Cinderbloom, I've been spamming ~1 hr a day selling in bulk over the past 3 weeks and havent had 1 buyer...the economy has really hit rock bottom on my server, being summer time and people quitting for D3/waiting for MoP it would take me forever to make 100k selling herbs. The best way I would recommend is farm up some herbs and ore, then spam trade selling it and hopefully find a person you can supply to. When I was doing it actively I would have 2-3 buyers at all times, was nice logging into my banker and them spamming me hoping I'd have more herbs/ore to sell to them.