Now I did a lot of research before I help an author self-publish. Here are the sites I found helpful and reliable to publish with:

-Smashwords
-Amazon
-Createspace

Smashwords and Amazon are great for publishing e-book versions of your book. Createspace is amazing for paperback versions of your book.
...................................................................................................................................................................
Smashwords:
Here is what Smashwords has to offer:

How to Create, Publish and Distribute Ebooks with Smashwords

Smashwords Distributes your ebook to the Apple iBookstore, Barnes & Noble, Sony Reader Store, Kobo, the Diesel eBook Store, Baker & Taylor's Blio and Axis360 (libraries!) and more

Earn 60% of List Price from Major Ebook Retailers and 85% Net at Smashwords.com

Smashwords Highlights:

We make it fast, free and easy to publish an ebook!
World's largest indie ebook distributor
200,000+ titles published by 55,000+ authors and publishers
85% net back to the author/publisher/agent
Distribution to Apple iBookstore (50 countries), Barnes & Noble, Sony, Kobo, Baker & Taylor, Diesel, Page Foundry and more on the way
Upload your book once and enjoy distribution to multiple retailers. Spend more time writing and less time managing multiple retailer platforms.
We provide simple, step-by-step instructions that make it free and easy for anyone to create, publish and distribute an ebook.
Distribution to libraries
FREE ISBNs
FREE ebook conversion to nine formats from a Word .doc
FREE unlimited anytime-updates to book and metadata
FREE consolidated sales reporting simplifies year-end tax reporting
FREE centralized metadata management
FREE exclusive marketing and selling tools such as our Smashwords Coupon Manager!

...................................................................................................................................................................
Amazon:
Here is what Amazon has to offer:

Make your book available as an eBook on Amazon.com and reach millions of Kindle readers with Kindle Direct Publishing (KDP). KDP gives you everything you need to become your own publisher today.

High royalty %. Publishing is free and you can earn up to 70% royalty while having the ability to set your own price.
Quick publishing. Publishing takes less than five minutes and your book usually appears on the Kindle store within a day.
Easy. A final manuscript and an Amazon account are all that you need to publish your book on Amazon.com.
Sell globally. Publish books written in English, German, French, Spanish, Portuguese and Italian and specify pricing in US Dollars, Pounds Sterling, or Euros.