You don´t need any software to view the camera. After you establish what the camera´s IP address is, just enter that in your browser and you´ll see the image.
Depends on what kind of resolution the camera is capable of and how many frames per second you need for quality. If you need live feed that's about 30 fps and a rule of thumb might be about 10Mbps per camera. Are you planning to run ethernet cable to all the cameras?
