Even though you may want to earn money online you shouldn’t be focusing on making money with your website until it is built and you are selling a useful or fun product or an idea or knowledge such as ebooks.
Without any product you have no chance of making money, and to make it even more interesting, after you pick a product you must get traffic to your website.
When you are first starting it is easiest to choose an established product or sign up for a company like Clickbank, that has products you can sell for them. Also called affiliate marketing.