Hello,
I am doing live broadcasting on the Internet and want to tell you that my upload speed is 200 kbs. Now if you want to stream with 3 cameras you will need 3 computers connected to the internet. Each camera should be connected to one computer to use it as video source.

Then you will need a broadcasting software to get the live feed. I am using BlinkoTV.com and it s working very good (I am doing HD streaming also).

If possible get a normal internet connection (not satellite), it will be easier and you can start broadcasting in a few minutes. You only have to get the broadcaster from the website and get an account.

I started a few years ago with broadcasting and I can show you the entire process.