Do you have any topic or content that would be suitable for an ebook? If not, that's your first hurdle – you need to have something to write about before you can start writing.
But what is special about an ebook compared with just putting the content on your website?
It sounds like a fad, ebooks are a buzzword and some people are fooled into thinking that because it's a buzzword it must be good. But that isn't how these things work. If you have an idea for content and you think an ebook is the best way to distribute that content, then go ahead. But if you're just jumping on the bandwagon without any idea of why you're doing it, you're not going to get anywhere.