No, you can make the suit play a short logon sound, but you can't disable it, unless you make an empty wav with the same name as the logon sound.
The game_player_equip entity is actually pretty easy to set up.
Simply place one and open its properties, then click the smart edit button. Now click add so you add a new keyvalue. The key is the weapon entity name, and the value is how many of this weapon the player will get. For example:
Key: weapon_9mmAR
value: 4
will give the player a mp5.