Hello. My name is***** would be my pleasure to help you with this. Please login to your account at Amazon.com. Select YOUR ACCOUNT. From the drop down menu that appears, please select MANAGE YOUR DEVICES AND CONTENT. On the page that appears next, you will see a CONTENT Tab and a DEVICES Tab. On the CONTENT tab you will see all of your Kindle book purchases. You can sort them by title, author or purchase date. Please locate the book that you want to download to your Kindle, select it by checking it and then click on the ACTIONS column. Choose deliver as the action. Select your device from the Device list. If you have more than one Kindle, make sure that you choose the Kindle that you are actively using. Don't select the Kindle Cloud reader unless you have downloaded the Kindle Cloud Reader APP to a computer or device other than your Kindle and wish to read it there.
That should help you with figuring out how to get the books delivered to the right Kindle.
The best way to get free books is to go to “Bestsellers in Kindle Store” and pick up “Top 100 Free”. You will be able to see the most popular free titles in the Kindle Store. The list is being updated a couple of times a day, so it picks the hottest free titles that are currently available.Here is a link to click on that will take you directly to the Top 100 Free List on Amazon.
Here's a link to a list of Kindle books under $1.00, that ay also be helpful.
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If you need further help, just let me know. I will do my best to help. Thank you!