A lot of the online book retailers are just starting to sell books in the epub format. Since Sony has dropped it's prices and become more competitive, they are an easy place to purchase material for your reader. If you find something at another ebook retailer that doesn't offer the ebook you want in a compatible format, you will need to do some converting. It's complicated and to some illegal but it is an option. Just google looking for converting one format to the one you need.
As for a charger, if you are going to purchase one, you might as well go with the Sony ac charger that they sell specifically for your reader. They aren't that expensive and it makes sense to use what they suggest considering your financial investment in your reader.
Good luck and welcome. By the way, tell Dobie I said, "Hi!"
