The first one that I am going to cover will take a few posts, but we will start with deciding what scrolls to sell in the AH. She mentioned checking TuJ already, but also wondering the best way to check the others that aren't listed there.
Well, there are limited spots (15) on TuJ that cover only the "Current Profitable Scrolls". If it so happens that most are unobtainable for you (rare drops, or you can't hit up Twilight to get your new recipies), you don't have the capital for purchasing Maelstrom Crystals (which will change now with the 4.1 vendor), or you are lower level and have zero access to all of these, we gotta go "old school" and check manually....Well, not really, we are still using an add-on, Auctionator.
To get the ball rolling, get to the auction house. Pull up your buy tab on Auctionator, and type in "Scroll of". As long as you have a bit of data behind you (with recent scans) you will pull up both the current auctions, and auctions that aren't up for sale (see left). This will assist you in snatching up markets that there are currently zero auctions for "X" item. 
Upon scrolling down, you will see the "top end" scrolls that are available. Now this won't pull the average sales like TuJ, it will give you an idea of the current market and the prices that they are currently listed at. Now obviously, you are not going to want to compete with 10 other auctions for "X" item, you will want to craft and hop into the lesser supplied markets here, you can feel "kinda" safe to work in when there are only a couple (as in one, two, or three) for sale.
Now just open up your Enchanting tab, use the search function (to the right of "All" on the top left of the screen), type in what enchant you are choosing, mouse over the mats needed, get your cost, and if there is no competition, I generally price scrolls at double to triple the mats cost. *Now if you are competing, then you just need to undercut them, and Auctionator does that for you automatically. =)
Now if you want to get technical, you can reset your Auctioneer data, scan twice a day for a week, and get a "recent" baseline for prices, then check your tooltip to see how many have been seen, what they have sold for, etc. Another option here is to set up a "shopping" list in Auctionator and add the scrolls there manually, and keep tabs on the ebb and flow of the prices.
For the time restricted, you can just skip over that last paragraph and only use my top "pictured" examples, they will more than provide you with enough information to decide which enchants to sell. Now stop reading and get to selling!
Don't forget, if you don't have auctions up, they won't sell. Make sure with your scrolls that you are utilizing a 24-48 hour auction, and don't fret if they don't sell right away, enchants normally sell within two days of posting for weapons, three days for 2H, and up to a week for gear. Although at current times, this might be a bit of a slow market for most, when Blizz announces new content (i.e 4.1 coming soon), the market will pick up considerably, then drop once again between content releases.