Where can I write my own e book?

Wattpad

It have lots of fantastic story on the website and there's high flow of people visiting the site, reading the stories. So once you got some fans, it will spread off and become extremely popular. You can write your stories on the website or even download the app and write qith your phone. Many authors I love from the site become extremely popular and the even launch the new-paid-version on kindle and other pay-required sites. Most importantly, it is FREE!!! If you are lucky, you may be contacted by scouts as well.

Examples of wattpad authors who ended up publish their books:
Brittany Geragotelis
Abigail Gibbs
Beth Reekles ( <3 The Kissing Booth)
Natasha Preston
Isabella Rae (<3 When summer ends)

Can't wait to read your book on wattapad.!

You WRITE an eBook on your own computer using a word processing program. If you want to self-publish via Amazon or Smashwords, both have utilities that will help you convert it to the appropriate format(s).

Try eContentdevelopment.com

You can write one on Amazon's kindle website, i think they might pay you for each time its purchased.
It's easy enough to create an account also. So you could try that out.

Hope that help.
Maybe check out mine?
http://answers.yahoo.com/question/index;_ylt=AqjXaiDGrJOdXkHn1FHMigef5HNG;_ylv=3?qid=20130405073910AAxMe3r

E book is written in pdf format here is like for adobe pdf writer- http://www.softpedia.com/get/Office-tools/PDF/Adobe-Reader.shtml