All of these depend on where you are fishing.
Best Jig? - Brand is going to be different from person to person so I won't even bother with that so I will say this instead:
- Football head jig - best fished around rocks
- Arkie head jig - best around wood and for skipping
- Alien head jig - best around weeds
- Swim jigs - obviously for swimming
There are other heads out there (rocker, ball, etc.) but these are the most common and what I fish.
Best color? - Personally I like black/blue. But keep it simple - black, brown, watermelon
Best Trailer? - This also depends. Most people will use craw trailers but you will find a very wide variety. Put something back there with a lot of action to get reaction strikes
Best technique? - Again, depends. I like to hop them through weeds with a hop, hop, sink, pause and twitch for 5 seconds, repeat pattern. You can drag them across the bottom. Swim jigs fish similar to a spinnerbait or even a crankbait, make it erratic.
ALSO, check out the how to videos here. Gene has several videos all about jigs. http://www.bassresource.com/bass-fishing-videos/#0
Hope that helps a little