This is the second post on how to publish free. The first is at the link above.
The project is to see if it is possible to succeed as an author using the free means available on the Web, not counting your time which is of infinite value.
I think it makes sense to go the Amazon Kindle route. It's free and user-friendly and it does not keep you from fanning out on to other platforms. If you keep your work exclusive for a while, you can join a profit-sharing program called Kindle Select.
As a Kindle author, you can create a bio page with a Twitter feed in the US, UK, Germany and France. My US one is here.
If you are just starting do not despair. If you use Word, just copy your writings into texts that are coherent and have a focus. Say exactly what your text is. You have complete control. Kindle will even give you a generic cover for your book. And Word will let you create a cover page that you can include if you wish.
Get a Kindle account.