Since inscription questions have been popping up more and more frequently, I thought it might be a good idea to write up a quick guide on how to prepare and execute a successful MoP glyph launch. This will serve as a centralized overview of the upcoming MoP glyph "rush".
Step 1: Buy cheap herbs. NOW! You can use whatever price you feel comfortable with (I've been working with 7g/ink, which translates into approx 20g glyphs), but you want to buy ANY and ALL herbs that will produce ink below that price. If you feel you've got enough, lower your price, but don't stop buying. Anything you don't buy is something your competition probably will.
Step 2: Process into ink. For the most part, you will be milling cata level herbs, resulting in large quantities of [Blackfallow Ink] and [Inferno Ink]. Find whatever method works best for you to offload the inferno ink, but hang onto the blackfallow. Store it in your GBanks, Alt's Banks, or Mailboxes, but you ideally want to get as much [Blackfallow Ink] as you can right now. NOTE: 1 stack of every glyph = approx 20k ink. Plan accordingly.
Step 3: Convert the ink. As late as you feel comfortable with, trade your blackfallow in for lesser inks prior to patch 5.0.1. If that's Monday night (or Tues for EU), great. If you want to do it the weekend, or even week beforehand, that's fine, but the later you can afford to leave it, the easier it will be to adapt and react to any hiccups. As far as how to convert the inks, you can visit http://mop.wowhead.com/skill=773#recipes:0-11+16+1 and enter "glyph of" in the search field and sort by reagent to get an idea of approximately how the ink distribution will play out. NOTE: if you have enough ink stockpiled, specific ink distribution will be negligible. IE. You shouldn't run out of any ink until you can afford to restock them at whatever your ink buying price was in the first place.
Step 4: Craft glyphs. All glyphs that don't appear on this list prior to 5.0.1 should be queued up. The new talent system for Cata went live with 4.0.1, and the new glyph system along with it. Be prepared to start selling glyphs AS SOON as 5.0.1 launches. If that means pre-crafting a certain number of glyphs so you can focus your early time on posting, then you should try to estimate how many posting cycles you expect to go through until you'll be able to get crafting again. My estimation would be that you will want to have about 5-10 of each glyph on hand for that first night.
Step 5: Keep buying herbs. Without the possibility of trading in Blackfallow for lesser inks, unprepared scribes will start flocking to old-world herbs to try to keep up with demand. Set up a snatch list for old world herbs that fall below your buy price from earlier, just make sure to ignore Cata herbs. NOTE: you don't even need to worry about processing these herbs immediately, so unless you are in need of a certain type of ink before [Ink of Dreams] becomes available, all you are trying to do is keep an edge in margins over the competition.
Step 6: Restock glyphs. Don't worry about price data and TSM settings at this point for restocking - keep EVERYTHING at whatever minimum quantity you need to keep posting in between restock cycles. Pricing and trends will only start to matter once the rush dies down. The purpose of this guide is to be able to take advantage of every possibility glyphs end up presenting without spending time over-analyzing everything.
Step 7: Important timelines to watch out for. First of all, you want to make sure you have enough old-world inks to last you from 5.0.1 until about a month or so into 5.0.3, when prices on MoP herbs will presumably start to level out. I'd give yourself approx. 15 weeks or so here to be safe. So, based on your server size, make sure you can last that long without NEEDING to restock (don't get forced into overpaying for old-world herbs). The first demand rush will come right after 5.0.1 launches, since that's when the new glyph system/glyph effects should go live. The first couple nights and then the first weekend will probably yield the highest sales. The second demand rush will come with 5.0.3, when a number of players will roll fresh alts under the new Pandaren race. Again, the first few nights, and especially the first weekend (since fresh alts won't NEED glyphs right away) will be the best opportunity.
Step 8: Come back here and boast about how much profit you made. Simple as that.
This thread will be updated as additional information becomes available, especially dates, so be sure to check back frequently.