To move whole car type 'A' (select all) then 'G' (grab) and that`s it.
To select only one car type 'B' two lines crossing where cursor is should appeal. Now you can select objects like in RTS games
If you want to make render of all cars in one scene check if they have different materials for skin, normally they share one material you just have to change the texture but if you want to render all of them, all of them have to have separate materials. (or if you render them without skins, just plain colour than it`s all right )
Just delete the floor and set colour of background in 'world' settings (F8)
OR
if you want plain colour but with shadow under the car select the floor than
go to material settings (F5) go to 'Mirror trans' section and unselect 'Ray Mirror' than go back to shaders section and select 'Only shadow'.
I don`t know, maybe it will work without unselecting ray mirror.
try first separate the car to another .blend file and then export it
to separate it create new file then go to 'file -> append or link'
choose 'LFS kit.blend' or whatever you named it then choose 'scene' and choose the car you want to have in new .blend file. After that delete the original scene with cube.
oh, and delete everything that`s not a model (lights, cameras etc)
I don`t know if this will help, just an idea
3ds exporter in blender always was sh*t, I tried script written by someone but it could only export models, and whole model had to be one piece (then you will have to add materials and textures in 3ds by yourself)
As for camera setting, here is my short tutorial for easy camera positioning, I use this trick in every Blender project:
first go to Add -> Empty and click button marked by red square
then select camera (it`s have to be pink) and choose from menu 'track to'
now select 'Empty', you have o check what`s it`s name (Empty is default but it can be also Empty.001 Empty.002 and so on) click small button thats marked and check 'OB' field
now select camera again, in OB type Object name of Empty and change buttons to what is on the screen
Effect shold be - camera is always heading to Empty now you can move empty so car is in the middle of view and move camera around
logitekg25 - To change view simply use numpad
1 - front view
3 - side view
7 - top view
5 - turn on/off perspective
2/4/6/8 - rotate the scene
0 - camera view