1) Creating and destroying entities is not generally how you would be culling objects most of the time. In B3D the only objects that get rendered are those which have a visible face within the camera's view and range. The entire geometry of those objects is flung to the card, though, so be wary of that.
2) No it is not sensible. This is what happens anyway but B3D is kind enough to abstract the process out so you can think of the camera in terms of it moving through 3D space. The only time you might consider it is at very large coordinates as mathematical errors can apparently manifest themselves as rendering errors (never experienced it myself - I guess the numbers have to be massive).
In other words, keep the worldspace that you use within a sensible range of (0,0,0) but don't feel that you have to keep the camera static.
3) Check. (EDIT: As in "test it and see", not "sure". Cos I have no idea.)
2) No it is not sensible. This is what happens anyway but B3D is kind enough to abstract the process out so you can think of the camera in terms of it moving through 3D space. The only time you might consider it is at very large coordinates as mathematical errors can apparently manifest themselves as rendering errors (never experienced it myself - I guess the numbers have to be massive).
In other words, keep the worldspace that you use within a sensible range of (0,0,0) but don't feel that you have to keep the camera static.
3) Check. (EDIT: As in "test it and see", not "sure". Cos I have no idea.)