If you are clueless about this business, I think you should make a start by reading articles on the webmaster boards (like this one). There is so much usefull information available and it might help you to make your descission where to start. There is not just one way. What works for me, does not automatically mean it also works for you (and the other way around). You have to find where you are good at and try to expand.

As I said, before spending your bucks - just read and learn. There is only a small percentage of newbies who stay in this business for over 6 months. Do not expect to make lots of easy money. As Xstr8guy said, this is hard work and you'll have to make loads of time available. Once you finally get things rolling (so-called snowball effect) you can make a very good living, but don't expect it to happen within just 6 months.

Hope you will find your way in this bizz.