Awesome, if you have the chance, I'd really appreciate a ground-up walk through for this.
in order to be able to spawn stuff in game for your own personal enjoyment, your best bet is to go find one of the hacks on this site and download it, and read on the forums how to get it ingame. What you seem to be asking medic is how to make your own hacks. At least that is what he is explaining to you. You have to write the scripts in notepad or wordpad, and save them as an sqs or sqf file. I would go open up some arma missions to see how the codes work for arma. Then you can compile your scripts, etc., and make them into .pbo files to use them in game, which is basically the filename for addons in arma. Get binpbo or pboview for that part.
Either way, it isn't the easiest thing to make a hack for arma. Your best bet is to get darky's. There is a spawner in that that will spawn most guns and vehicles, as well as all the basic arma ammoboxes, and if there is something missing that you want, you can go find the classname for it at a site like
this,
this, or
this, and use a couple basic codes in the player console section. Type in your name at the top and use the execute code box to
put in
player addweapon "classname"; for a weapon
put in
\player addMagazine "classname"; for ammo
put in
"classname" createvehicle (position player); for vehicles.