advanced setup for mapping

I need help on how to make people spawn with no weapons, so they have to grab one in certain part of the level, and how to make messages pop up in certain situations, any link/tutorial/information site about these things??

thanks in advance

i'd not go there if i were you. basically you need to use a weapon_strip to remove players' weapons but i've seen a problem with them picking up even the grav gun afterwards so this whole trick has a bug in DM.