I sell on eBay all the time. I sell things for other people in addition to my own personal sales.
Go into your My eBay page and click the Account link. Under Account Summary, click to see Fees. You can see your current uninvoiced fees. To the right is a dropdown box for invoices. Choose one and view it. It will itemize each auction and the fee(s) for them. It even distinguishes between the Final Value Fees for the item and the shipping.
Basic listing is generally free for the first 50 items in a month, but you'd have to pay for any listing upgrades you selected, like using more than one category or having a subtitle. The Final Value fee is 10% of the sale price+shipping charged.
Here is the Fees page: http://pages.ebay.com/help/sell/fees.html
PayPal takes their payment processing fee at the time a payment is made. You are never billed for that.
The Seller Dashboard is simply an informational page and there is no cost. You may not have access to it if you have too little recent data to calculate. If you follow the link Mary L posted, it even specifically tells you that it is completely Free
It is possible Wild Woman is confusing the Dashboard with having an optional eBay Storefront, which has a monthly price of $15.95 if you subscribe for a year.
Added: eBay started charging the FVF on the amount including shipping to discourage sellers from inflating shipping. List your items at the price you want/need to make, taking fees into consideration, and keep your shipping costs accurate. You'll have more bids/buyers that way.
Feel free to private message me if you have more questions or need help navigating the site. I don't often return to a question after I post an answer so I might not see a follow up.