The first thing you should know, is that camera mods isn't the thing you should try out first. Learn how to comtrol the ingame camera first, which controls you can use and shortcuts. A camera mod won't automatically give you more knowledge about how to take better pictures. I myself managed very good without the camera mod at first. And I won't say that the one I've got now makes everything a lot easier...
Learn how to use the play camera and the TAB camera (camera man mode), and also which shortcuts you'll need to steer the cameras better. After that, you can see where you need more control, and find a camera mod that does what you need it to do.
Just like in real life, getting a brand new digital camera with lots of buttons and funny attributes won't neccessarily take better pictures than that 50 year old film camera you had before. Learn how to use the ingame cameras before you figure out what you need to "upgrade"

A few shortcuts you'll need:
* the arrow buttons (or WASD - moves the camera sideways, forward and backwards)
* Q and E (only in TAB mode) - up and down
* , and . rotates the camera
* mouse - tilting the camera (scroll is out/in)
* C (takes ingame picture)
* Page up/down (up/down one floor)
* Home/end (up/down walls)
* + and - shifts the lens from normal to wide and/or narrow (only TAB mode)
And a little trick I've learned - if you're photographing in build/buy mode - press R to get the grids away (since R - the recoloring tool - is one of the only shortcuts that does this...)
