I am currently working on a book series for a client that is been released through Create Space. This has actually just become one platform with Kindle Direct Publishing. It is run by Amazon and is an easy way to get a foot in the door without any major commitment because it is a print on demand service - a single book is printed each time a purchase is made. They also provide a free software and previewer package for creating books for the kindle version. (It is extremely basic but functional). You then set your price and they take a cut of the sales. There's a bit of reading up to do but if you have any design experience then you will pick it up pretty quick.