To write an eBook, you basically have two main options to approach this task:

First
use PLR-Products, improve and mix them with your own information and ideas,
create a new title and cover, sell them as your own, put your links into it, offer Resale Rights, create a Website and a Splash Page, etc.

Second
use the knowledge you have inside of YOU! There is plenty, but you just might
not be aware of it, i.e. hobbies, skills from your profession, special experiences
you may have encountered and how you tackled them positively, knowledge sources in your friends circle for interviews, and more. Just reflect, what kind of stories, information or special things you are emotional about and which you would tell to a special friend or teach to somebody. Do you have some ideas already? Fine!

So let’s start with the basics you need to prepare or think of:

Define the title of your eBook first!
This is essential in order to keep you on track and to motivate you to find the right information to fill this niche. You do not need to have the perfect title. A draft will do, you can refine and tune it later. But the main theme should be clear.

How to create ideas?
To create your own product, you need hot ideas that are selling and which people are
interested in to learn about. Here are a few anchors to start with:

* Check out TV, News, Magazines, etc., to find out what’s brand new, stirring
  and moving people. This is not difficult; you probably do it already every day.
  But now do it with the goal to filter out what you like, find interesting and
  write it down for later use.

* Go to a real Book shop, check on Amazon, Barnes & Noble or in your Library
   which physical books are selling best. For sure you will find something you
   can use for your later work. Go to Amazon right now!

   Then scroll down a bit to “Features & Services” (left side), under “Amazon
   Exclusives” click “Amazon Bestsellers”. Enjoy the list, make notes, even
   buy an interesting product to do a review in an Article or Report.

* Then go to Clickbank Marketplace and check your Keywords for products
   with gravity higher than 10-15 %

* Look at the most searched Keywords at the most used Search Engines
   like Google, Yahoo, MSN, etc. Check what are the top phrases and key
   words for help, fun, learning, whatever you may think of. Use the
   Keywords as a starting point to write articles or reports, related
   to the topics people search for. Provide solutions that answer the
   questions of their search query.

Useful Keyword Tools:

Wordtracker
Generates keywords for SEO and website optimization.

Keyword Discovery
Compiles keyword search stats from worldwide search engines.

Goodkeywords
Downloadable freeware that queries a number of popular search engines to identify good keywords.

Google Alerts
Email updates of the latest relevant Google results based on your choice of topic or keywords.

Google Suggest (click Advanced Search)
As you type in a keyword, Google offers suggestions and shows the number of results. Remember that the most popular topics are also those with the most competition. Therefore, you better focus on the lower level, maybe the 50th to 200th most popular keywords or phrases you found. You must try a little bit and if you start getting results, refine and tune further until you see an improvement.

Google Trends
Shows you the latest used Phrases and Keywords as Hot Trends, including graphics. Let you inspire on what people search for. Come back often to get more ideas.

Conclusion
To collect every possible idea, write down everything which comes to your mind, do not rate, and just keep it in your file for later reference if needed. Once you feel well stuffed with ideas, material and notes start with your art work of writing the book.