This is very easy to make an ebook. You can use adobe's acrobat reader full version to make a pdf of your text material. Or you can use softwares like Microsoft Word or Coral Draw, where your typed material can be exported into PDF format. Here're also various websites online which offer you to make your own ebook as an application. But these method is not used by world so much because of PDF format's own popularity.
If you have a blog or website about any specific niche like 'fitness' 'money management' 'hotels of world' or 'history' etc. Then you can make an ebook which would be pointing to your website or blog. You can upload it to one or more ebook website where users can download it and check your information like your email, your phone number, your website, your business etc.
It works really good for your business or web project. You can give it a try.