So just morbid curiosity, whats with the giant yellow wall taking up the second to last row in the market and now it being closed today?

I recently enchanted a diamond sword with Sharpness V.  I have read Fatnoob's post on setting up a stall but am confused by the item id for an enchanted item as such.  So my questions are as follows...

1) what is a good fair price to ask for it?
2) my sign should be as follows

        first line blank?                 (is this necessary?)
                    1
    amount I am asking for        (no : since not buying back?)
    item id # for a sharpness V diamond sword 

3) which would be what? the data value for an enchanted item confused me)

Thanks for any help and sorry if this was covered in another post I couldn't find one.  But I would like to understand better and get in on the market part of this server more.

Heya everyone, I'm new to the server.  Been on for about three days now, and loving the buy/sell and mining world parts of the game.  I'm by no means new to minecraft, I have been playing for a long time and have been part of many survival worlds both single player and with a group of friends via Hamatchi for a private server.  I have been farming and selling to build up noobz, I have not bothered building anything yet as the wilderness looks like Griefville or a post apocalyptic wasteland so im just saving up until someone will sell me a plot to build on in a town or something.  I'm guessing that's the next logical step...despite my experience with minecraft I have never done a public server before so this part at least is new.

Anyhow, Hello and if you have any advice besides the guide section of the forum like what I should be farming to make good money besides wood please let me know.  I finally got some diamonds, made a pick, and farmed a stack of obsidian just to find it doesn't sell as good as wood....that was a little weird.