Although it seems like there are thousands of webcam networks out there, the vast majority of them are actually affiliate sites of a major network. For example, if you look at the cam pages for Brazzers, Vivid, and XHamsterCams, you will see that they are all actually Streamate and Playboy's site is actually Naked.com. If you sign up on one of these affiliate sites (or even worse, a virtual studio), there is a good chance you will get paid less money than if you signed up directly on a major network itself. So below I put a list of the top webcam networks out there and a link to their real sign up pages. This way you won't get scammed by a virtual studio or affiliate site.
LiveJasmin is the most visited cam site in the world. Pros: They have a beautiful website, great video quality, and a lot of traffic. Cons: They payout every two weeks and hold the first payment, so you don't get paid for about a month. You also can't charge a high rate from day one.
This site has the most relaxed rules and is the most fun. Pros: Tons of traffic, the most fun, and has the highest payout. Cons: It's not for everyone. If you are not outgoing or very social, this site might not be your best bet.
Streamate has been around since 2003 and is one of the largest cam sites in the world. They even broadcast on Pay-Per-View with Immoral Productions (Porno Dan). Pros: Super easy to use and has consistent traffic, it is great for beginners, and pays weekly. Cons: This is the most strict cam site out there. So you don't have the same freedoms that you get on other cam sites.
Here are some other decent choices