Ideal Equipment: Four or so surveilling cameras accessible remotely

[Christian123]

How is it possible that I might have four or so cameras surveilling a particular area where these cameras would be accessible remotely, recorded on location where the recording can be viewed and deleted either when on location or remotely also.

So basically how do I have a video network that would record and where that network and recording could be accessed remotely from anywhere else and the recording could be deleted remotely or when on location again.

What sort of equipment would be needed

Cameras (cables, power etc...)
DVR
Router

anything else?

Thanks for any help with this