Wanting to sell items on Ebay, but don't know how it works...?

[1DisneyNut]

I already have an account with Ebay, as I buy many things off the website however, I am curious as to how one sells something on Ebay.

Does Ebay charge me per month to sell on Ebay or per item?
What percentage of money do they take out of any items I sell?
If my item doesn't sell, do they still charge me anyway?
Do they charge me more if I choose to sell an item for 15 days as opposed to 6-7 days?
If I put up pictures of the item does that cost me?

I'm clueless as to selling items on Ebay so any advice beyond what I asked would be much appreciated.

Thank you.

[Rebecca Withers]

When I have sold things on ebay they are free if they are under £1 and you don't have any extras such as buy now or you don't start the sale immediately. Ebay haven't taken any money off me for what I have sold. You can chose the amount of days you sell an item for, for free. It is now free to have 12 pictures instead of 1. It says on the ebay website any fees that they charge.