What field of view should I choose in a first person shooter

There's really nothing more to it than practice unfortunately. I've been playing PC shooters since the original Doom and thought I would never get into console shooters, but after playing a bit of CoD4, I started getting into it and after a year or so of playing, I felt as in control playing with a controller as I did with the keyboard / mouse combo.

One thing though, you will never be as accurate using a controller, it's just impossible. Whereas using a keyboard and mouse in a shooter could be described as "point and click", with a controller, I've found that it's more like sweeping towards the target and picking the right moment to press fire in that sweep.

It sounds kinda strange, but it can be 90% as effective as keyboard / mouse control once you get used to it.

Camping, in a first person shooter (or any other pvp genre, really) is the act of waiting in a particular area to take advantage of the same players repeatedly.

Spawn Camping means lying in wait just outside the area where players respawn, killing them as soon as they are alive again.

Camping might have some overlap with holding a position, but most places considered "camping" aren't areas that would necessarily benefit from being held in the first place.

It is, however, a pretty subjective definition that multiple players will disagree over.