The best thing I can recommend to you is to download the Kindle for PC program from Amazon. After download, you can register it with Amazon and then it can be treated like a Kindle or a Kindle app. You will be able to download any book from your Amazon cloud, sync with the book you are reading on your iPad, etc.
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.