how do i remove the shells when i shoot minigun / shotgun?

when i fire rockets, it looks like a lamp is light around the rocket, glowing on walls and stuff. removable?

how do i remove shadoweffects on walls on all maps? vertexlight something?

when i aim at somebody, i get an icon to the right with his head. how do i remove it?

can someone make me a script, so that when i fire with shaft, i have no crosshair, and then set xhair back. i use cpma. remember it was some command called vstr something