It is up to you to do the research into each method and figure out which avenue to explore. Bear in mind that sometimes these methods work best together to create a wonderful synergetic effect.
1. Pay-per-click advertising: This method involves placing small adverts on major search engines and websites. Try running a Google search for almost any term, and you will find a list of sponsored links down the right hand column. This is an example of pay-per-click advertising using Google's own program, Adwords.
The idea behind PPC is simple. You write a small ad based on some keywords. You agree to pay a maximum amount of money each time a visitor clicks on your advert; this can be as low as a few cents to as much as many tens of dollars. Generally speaking, the services which provide the most lucrative commissions, such as insurance and loans, will cost you a lot more per visitor. If you can make more money from your commissions/sales from the visitors you lead to your website than you spend on PPC costs, then you are succeeding. It is the fastest way to make money online, but be warned - it is something of an art, despite the simplicity of the execution.
2. Blogging: This really is all the rage at the moment. Blogs used to be glorified diaries, journals to record your personal thoughts. Recently however they have evolved into small, free mini-websites which can be easily monetised.
For example, you can set up a free blog in a matter of minutes. Then you can add some affiliate links to products relative to your niche in there and some Google Adsense (the flip side of Adwords, I.e. instead of being the advertiser, you are the publisher, and therefore receive money for every click a visitor makes on one of the adverts put on your website).
Again, there are techniques you must know if you wish to pursue a successful career blogging. The good news is that there are some excellent eBooks on the market which will take you step-by-step through the entire process. They are well worth the investment. In my opinion, this is the best option for the complete newcomer; feasibly you can replace your job income with just blogs, and it provides great all-round training that will allow you to succeed in just about any other area of net marketing. Of all the different ways to make money on the internet, this is the one you should definitely start with.
3. Launching your own product: This is probably the most lucrative option on the table, but arguably the hardest to do successfully. You could choose to write an ebook, or even launch some software (not as daunting as it sounds - effectively you would come up with the idea and hire a freelance programmer to build the software for you).
Creating the product is the easy part, though you have to be as sure as you can that it appeals to an audience that will definitely want to purchase it. You could then upload the product to Clickbank and seek out some affiliates.
However, the best chance you have of getting big traffic and big sales is to participate in joint ventures. Joint ventures involve two or more people coming together in a mutually beneficial relationship. Let's say you have created an excellent ebook on cookery. You could the approach some internet marketers who have big lists of email addresses which are targeted for the cookery niche. They could send out a mass email to their list endorsing your product, taking a slice of all sales (usually the majority). Joint venturing is a whole new facet to internet marketing, and one that is well worth spending time reading about if you wish to create your own product.
There are a heck of a lot more different ways to make money on the internet, but many represent different spins on existing ideas. You can be a relative newcomer to the internet marketing scene, but if you can show some imagination and innovation, you could find yourself becoming very wealthy in a short period of time. Always be prepared to learn and experiment, but first and foremost just get stuck in.