This is the SAFEST way to do it:

Put a buy zone in for each team somewhere NO ONE CAN GET TO.

Use armoury_entity for the weapons.
( may require expert FGD - see http://www.superjer.com/learn_adv.php )

You can NOT place pistols without some really ugly map hacks.

Just make a block. Put the AAATRIGGER texture on it. And select it and press CTRL+T and make it a func_buyzone.

Set its properties to be for CT. Then make a new one for T.

Try I think: player_weapon_strip

It can be complicated to use but it will take all weapons from a player if the player triggers it, i.e. you might need a trigger_multi or to hook the GAME_PLAYER_SPAWN event.

You CAN use info_player_equip to give weapons but that too is messy and complicated and might not ALWAYS work for no reason.