if im using a brown and green worm,about 6 inches long,does it matter if i use a black sinker, or should i use a brown sinker.

it wont hurt using the black one, but if you have a brown one ,wel that wouldnt hurt either

You have to remember that black leaves a greater silhouette so if your fishing in muddy water, cloudy days, or night I would go with the black.  Any other time probably the brown

go plain if you want. I dont think it matters.

I use a plain weight about 90% of the time but will occasionally switch to a red one and I can't see any noticeable difference.

well most of the time like 85% i use a black tungsten weight or just a plain led weight the other 15%

bubblegum.

i dont think it matters but if u feel it does i know of a way of painting them   take a shoe box open it up and stick toothpicks all around on the edge of it  then take the color u want in spray paint i just use black and spray them quick    if u want to get hitech u can add some red or green flake (optional) then when the spray paint drys  just add a quick layer of ememble or appocayse so u get a nice finish and it wont chip as easy

Bring those nicely painted worm weights to my neck of the woods, after a couple of casts rocks will have chipped off the paint and feesh don 't seem to bother if it 's painted or not.