If you already have a product in mind already, then you need a means to create that product, such as a PDF creator, these handy tools are part of a marketers tool kit that helps to create free bonus reports that they usually add to open a brand new email list and actually succeeds in getting subscribers by offering a useful free report.
Product creation as an internet marketer is something you may have to get used to as this is a neccessary method of drawing in subscribers and customers to your web businesses, of course further down the line you may find the need to outsource the writing and product creation of a physical published book or ebook products and software if you plan on releasing something for your subscribers to use rather than just read.
One great book that addresses the idea of creating a book of your very own for profit as a business is the Author And Get Rich Book By Glen Dietzel, it is a fascinating read from one of the internets best internet entrepreneurs and digital book publishers who certainly knows his stuff, the book which I wrote a review on here - Author & Grow Rich has all the relevant information contained within it to kickstart your book publishing career, whether that be online or offline, the book comes highly recommended, not just by me, but other internet marketers who have also found it useful for their own business growth.
In fact having a blog that you have been writing on for awhile you will have a lot of your main content alredy there on your blog, so it's just a matter of collecting all of your useful posts and fleshing them out a little and actually getting on with creating your very first product out of existing content that you own.
A simple report, pdf or ebook is usually the first product anyone should attempt and then later on you can learn how to create software or outsource that to someone else, you'll soon find that once your business is in full swing that it's best to pay others to do the work that you may not get around to completing on schedule.
But if you want to go it alone in the world of ebook creation, Openoffice.org is the place to go to download the necessary software(assuming of course you don't already have it!) be prepared though to have quite a large disk space or some alloted memory as it takes up quite a bit.
With this software you can easily create pdf documents which are in effect ebooks anyway and with a free option, it just sounds better to create something that you can sell with free software, all it takes is a little learning along the way, but you'll find that the internet is like that.
If you need a site to sell your own products, digital ebooks or any digital download, then give Ejunkie a try!