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It is extremely imperitive to do daily searches. If you don't all your information will be 'out of date' and you will end up making silly purchases and auctions. The system isn't automated so you have to be constantly on the look out. Searches should be done at least 3 times a day for as many consecutive days as you can. The economy in
World Of Warcraft is much like the real world economy in that it can change in a momemnts notice.
There could be 50 stacks of runecloth on the auction house at 5 o'clock selling for 2 gold a stack and three days later they could be selling for 20 gold a stack. In that case you would know when is the best time to sell runecloth and when the best time is to buy runecloth.
This guide covered the basics more in depth than most guides you see out there. However, there are a few options you can play with if you wanted to. The options are more for narrowing your search down to specific items. You are encouraged to play and test these options when you have done a few scans at least.