123 email marketing for free

I have several businesses online that I am Marketing. The clients are on a low budget, so i am locating Genuine resources to get the word out.

excitinganduniquenewbooksforsale.blogspot.com is my blog site. I’ve written some quite clever, cutting-edge things and am trying to market them myself before I show them to a publisher. They’re books that I believe that a select few discerning readers, who appreciate great quality [...]

Which is a better marketing tool for a new book:
a free chapter from the book, or an audio clip download of the chapter they can listen to on a website?
Which leaves one with a better feeling about the book, overall?
Thanks

I would like to freelance as a travel writer. I enjoy travelling, photography and writing and would love to be able to combine all of them.
I have a copy of the writers market with lists of magazine publishers in the UK. How do I approach the editors? Phone/Email…what should I say?
Thanks