Life is learning and so is any new activity.
I agree with many other self-publishers, marketing and sales are a tough one, but there are many things you can do to overcome this hurdle. Persistence in marketing is the first thing. Write more books is another. If one of your later books becomes a bestseller, then your early works might be caught up in the mania to get more, more, more of your creativity.
Publishing is time consuming whether it is self-publishing or traditional. You need to get over the idea that you can dash off a few quick pages and make a million. There may be exceptions to this, but they are too rare to use them in any calculations.
Self-publishing through Amazon's CreateSpace or Lulu is very, very inexpensive. Your only hard cost is the purchase of one copy of your own book for review, but you can skip this if you're confident everything will look okay. So, the cost could be zero. Producing an ebook is even cheaper.
Some have recommended spending a little money on a professionally done cover and editing. This is excellent advice, especially if you are not a designer or an experienced editor. But even editors will recommend having someone else look over your work with a critical eye. It's too easy to miss things in your own writing, because you know what it's supposed to say. You know what it all means. Your reader doesn't have that luxury of prior or insider knowledge.
But even if you don't have money for such things, I would suggest going for it. You could end up spending zero, promoting your book online using many different techniques (Facebook, Amazon marketing techniques, blog comments, forum posts, etc). The main thing is to get your book out there. Do as good a job as you can and then make it available.
Everyone has something to say that can help others in life. I think getting it out there to help others or to inspire or entertain them is too important. Don't sit on your creativity. Share!
I have never worked with any of the traditional vanity presses. They charge up to several thousand dollars to produce, edit, design and market your book. Some vanity presses have been scams. Others may be legitimate, but I've never been interested in using their services.
Traditional publishers frequently give an advance on royalties, which is nice, but then they usually don't promote the book, relying on the author to do that.