Just in case you use c-script and are about to try A8 (Litec), [as I had problems with it,] this might help:-
In c-script you put a biped into the game and give it an action (walking etc.) from a list.
I tried this in A8, but there were no actions.
If you want to put a biped into a basic game, I have found this is the easiest way to do it.:-

Build a hollow box, (texture it if you like), give it a name in save, add a model player, go to Map Properties and click on New script, select Template project. (close box)
Open project manager, click Add, click Script, (make sure ‘camera’ is in the box), click the drop down arrow and select Start up and then add Player parameters.
Close the box, highlight player and add 'behavior' build and save, and then run. You can alter the player’s properties by going back to Project manager, select customize, and then highlight player and click ‘customize’ in the pale blue bar – don’t forget to save your alterations !!
Hope this helps someone!
David.