Hi there Hector
and welcome to this forum !

Well, in my opinion the first thing to start with is to decide HOW you intend to do this money. I'm asking because while you posted in a thread called "Google Adsense & Money making " you are talking about online business in general.

Do you intend to start with Google AdSense ? IMO this could be a good way to start, as you'll learn how to promote your website(s) and how to drive targeted visitors to the sites. You won't get reach from AdSense but it could be a good start. however you need to put a lot of passion and spend a lot of time into it.

As for what kind of site, if we talk about blogging, it really depends on domains you are an expert in or at least very passionate; like that you won't see this activity as a pain in the ass but you'll really enjoy. If money start coming, the better for you !

All best,
Radu