I've read quite often recently that a mailing list is a good marketing tool for authors. I have a wordpress website which gets a few visitors, but I'm not sure where to go from there in setting up a mailing list and what's the best way to go about it, so I'd be grateful for any advice. I don't have a lot of money to spend so if I need anything other than the website to do it, recommendations for cheap (or free) services would be appreciated. (Apologies if this has been covered elsewhere, I did search and couldn't find anything).