my 2 cents:
First timers will or will not read any information thrown their way, no matter how it is presented (sticky, mail, extra bar ....).
If they don't read it, their post may be suboptimal.
If they are lucky, a kind soul will spend time to find out what it is they are actually after, if not they might start thinking about changing their question / wording / explaining their problem better.
If they don't they won't get help.
This is their problem, not mine. The information is there - read it and use it. If you are too lazy, don't be surprised if you don't get the desired help.
What ever additional information you offer first timers, they will still have to read it first.
An index is a nice idea, but won't be terribly useful to somebody who has the calculator next to his computer to input the sums in Excel. If an experienced poster links to an indexed article, the OP will often come back asking "I don't see how summing figures automatically helps me. Can you please redesign the nuclear power station for me? - And please don't forget that I have to power it with green bananas."
Same goes for good posts / bad posts examples. It is difficult to strike the right balance between enough and too much info. I tend to err on to the side of too much.
Only experience gives you an idea of how much info is needed to answer your question. And if you don't even know what your question is - then how would you know how much information is needed?
Example: I have heard of pivot tables and have seen them in action. I never have designed one myself (no need so far / no large enough data-set). If I ever needed to design a pivot table, how would I know what to ask for and which information you need to give me a helpfull answer?
Would: "I have a data-set with speeds, times and direction of cars on some streets. I want to find out on which street at which time the cars go fastest on average. Can you help me make a pivot table that gives me the answer?" suffice? Or would you need waaaaaaaaaay more info? How would I know if I don't know which info is needed to set up a meaningful pivot table? how would an example post help me?
EDIT: This actually looks more like a dime than 2c to me