Kindle fire has promise

Good news. Received a Kindle fire for Christmas. I had already downloaded the book, Mis-Ant-Ventures of Billy Ray Scout, onto my pc. The book automatically popped up on my Kindle as soon as the device was registered. There has been a few sales, but not like I had hoped. I'm wondering what a series would generate. I'm also wondering how hard it would be to add illustrations into the text of a book.
This will be my next effort. Perhaps only a few illustrations to test the waters. Everything is a learning experience for me and I hope my posts help someone else who's considering going this route.