There are at least a dozen ways you can make money through internet. But first you need to get armed with a lot of patience, skepticism and hard work.
If you already have some money to invest in your near future business, I would suggest going with Adwords and affiliate products and choose a less competitive niche.
An online business with no traffic is useless. So, I would go after traffic methods first. You could get free or paid traffic but each of them has pros and cons as for paid traffic is less time and work involved and vice-versa.
Email marketing is very profitable, but since you ask this question I believe it's out of the question because it needs time to grow a list of subscribers.
A good but slower way is to have your own website/blog and advertise paid ads, Amazon products, eBay products, affiliate programs and CPA products.
I would suggest to stay away from PPC and pyramid schemes or anything that promises quick results as they usually are scams. But you can never tell.