Trying to make a laser........need help with the materials

hey there

I’m trying to make a laser saw, for a game, and I’m running into a few problems


-How do I make the object a laser? By that I mean do I duplicate a line twice, each one corresponding to the laser, the glow and the halo?

-How do I assign materials to seperate objects, I click the assign button after highlighting a line but when Render, its a uniform fuzzy red.

-And now a bonus one, how do I make the inside of a cylinder glow? Like a energy weapon.