Pistols and Ammo on the ground Tutorial
There are two ways of doing this. I will show you both. First
decide whether you want your pistols to respawn or not.
In my map the pistols respawn every 5 seconds (five seconds after I pick up a pistol another one will appear) This way I don't have to make as many weapons on the ground. Just one of each!
Now, You may like the other way better depending on your map. Making it so once the fully loaded pistol gets picked up it doesn't respawn. (it will not come back) If you do it this way just remember to make enough pistols for everyone.
trigger_multiple with render on and off trigger_once with render off
You either want trigger multiple or trigger once.
Decide if you want one pistol or multiple pistols.
ADDING WEAPONS AND AMMO TO THE GAME_PLAYER_EQUIP
when you open the game_player_equip properties the first thing you need to do is click smart edit.

Then click add (to add the weapon)
key --  weapon_elite
value -- 1 

Now click add agian (to add the ammo)
key --  ammo_9mm
value --  4   (for 4 clips)
weapon_fiveseven.mdl            

weapon_p228.mdl

weapon_elite.mdl

weapon_glock18.mdl

weapon_usp.mdl

weapon_deagle.mdl
ammo_57mm    full = 2 clips

ammo_357sig    full = 4 clips

ammo_9mm      full = 4 clips

ammo_9mm      full = 4 clips

ammo_45acp     full = 9 clips

ammo_50ae       full = 5 clips
Inside the game_player_equip click on
          flags and check use only
Rendering the sprite on and off is how I made the pistols
         disappear and reappear. (as shown below)
models/w_fiveseven.mdl          

models/w_p228.mdl

models/w_elite.mdl

models/w_glock18.mdl

models/w_usp.mdl

models/w_deagle.mdl
Name the cycler sprite elite
    (where it says name)
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