Firstly you will need to login to the unit , go to System -> Digital -> Channel type, then select the configuaration that supporst IP. An IP camera is then connected to this unit via it's RJ45 (lan port) using a network switch or POE switch.
Has this got a side cable exit point on the bracket?
No it does not have this feature.
Request DVR for this Camara & two external camera
Any DVR that supports TVI will be suitable for these cameras such as the Pioneer Quattro.