What do I need to create my site?

[Casey Rozenberg]

Hello BP, I am new here on the forum, but from time to time I visited it and enjoyed reading tips and your experiences. I am a new investor and I have clear ideas of what I want to do: a website. 

I am not an expert and I wanted to ask what do I really require to build a site? How much would it approximately cost? 

And last question: would you start investing in a site (I mean your own) if you would be 99% sure of your idea?