I was quite sad that I didn't get a chance to level Inscription in the Beta, I would have liked to provide some insight into the progression before it went Live. Luckily I was able to get Kaliope to Dalaran last night (thank you Oldone for getting our guild into the city!!) and visit the Inscription trainer. And thanks to my newly leveled Herbalism, I was able to hang out in higher zones and farm the herbs needed without fighting the throngs of levelers.
The bad news is, if you leveled past 350 then Ink of the Sea will probably be gray already. I was sitting at 359 (purely accidental, I stopped trying at 350) when I visited the trainer and it was gray to me. The good news is that some of the Outland recipes are still yellow (such as Frost Trap, Frenzied Regeneration and of the Ghoul) so you can use them to hit 360 if you aren't there already.
At 360 the recipe Armor Vellum III was still yellow, so I used that to get more skill points. If you want to ensure a skill point you can use the scroll recipes instead. You learn a new scroll every five points, so you could make those all the way up if you want to conserve ink. At 375 you learn Snowfall Ink, but I didn't have enough rare pigments to get a skill point from that. It's worth a try though, so go ahead and make what you can. You can also train the new Northrend glyphs at 375, so once you make your inks you can start cranking those out. Sadly they become yellow at 380, but you can still keep making them to hit 385.
Reaching 385 is the main target here - this is when the Northrend research is unlocked. You'll probably want to save all of your Snowfall Ink for researching, it requires one each time you use and three Ink of the Sea as well. My first researched recipe was totally new to me: Glyph of Death and Decay. It's a Death Knight item and none of the removed trainer recipes were for DKs. So we still don't know whether the "unknown" recipes are research or not, but clearly some researched glyphs are not in my listing. I'll be keeping tabs on this and making updates to the site.
At 390 my new Researched glyph turned yellow, hopefully it or some of my other researched recipes will see me to 400. Otherwise I'll be reduced to making more scrolls :( On the upside, I sold a few of my new scrolls for 5g each, so maybe it's not all bad. I made the STR and AGI ones because INT and SPI never sell. Another good bit of news is that Northrend Research is orange when you learn it and you get a skill point for it. It's still orange at 390, so hopefully I'll be able to milk it for a bit. I'll keep you posted on that as well.
I hope this helps some of you who haven't had a chance to work on Inscription yet - Good Luck!