I would like to install outdoor cameras at the front door of my house

I would like to install outdoor cameras at the front door of my brick house. I don't know if there is an electrical source but I'm assuming there is some type because there is a lamppost in the front controlled by a switch inside the house. How easy is it to set these up? Most of the systems I saw before Xmas had six or more cameras. I only want two on each side of the front door. Can you recommend a good system and if I could install it myself how would I do that?

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