You’re not going to find copyright violations of LucasArts properties as DAZ commercial products. There have been some freebie/fanart versions; here is Wayii’s for M4, which can be autofitted to Genesis/G2F. No idea on the other clone troopers.
Second question: Two ways. If you just want it to look like it’s glowing, give the material comprising that part an ambient color of white (or whatever color you want it to glow; if the diffuse is colored, probably white) in your Surfaces tab. If you want it to actually behave as a light in the scene, you need to select the material in the surfaces tab and ctrl+click omnifreaker’s UberAreaLight base (found under Light Presets in DS) to make it an emitter. Mixing this with UberEnvironment lighting tends to produce grainy results, so test before doing your big final renders.
Third question: You need those parts to be on a separate material zone, so you can turn reflection up to a higher amount and the shader to “glossy metallic” or “glossy plastic” on just those sections. Otherwise you can try creating a black/white map for the Reflection Strength channel based on the UV of that item, where black will be non-reflective and white will be your reflective sections.