No, I am not going to tell you how to order wine. But here is what I do if I happen to check out a restaurant's website before going: if they publish their wine lists, I go to winesearcher.com to get an idea of how much a wine I may want to order actually would cost to buy and then see how much the restaurant marks it up. Some markups are not as bad as others, and that may help me decide.
Of course most sites don't have prices published even if they have the wine list online. Sometimes you don't know what type of wine you will want, and then sometimes you may just want a great wine, regardless of the cost.