This is a very broad question. It all depends on your requirements and the bandwidth needed for your project.
The bandwidth depends on how many viewers you are expecting, how long would they be watching, and the quality of your stream (low definition - medium definition - high definition).
You can use our bandwidth calculator to have an estimation of how much bandwidth you will need.
However, before buying we strongly recommend to talk with one of our sales representative to have the most accurate estimation. Contact us at 855-896-9300.