Nikon 105mm micro is a great lens which I use with great pleasure.
Like cgipson I usually use the R1C1 flash, normal flashes not so much but that's more because I only just bought those and I still kind of lack in knowledge when it comes to flash.

The R1C1 does a great job with TTL for me usually, nothing too complicated. ^^
As for settings: Situations differ, but usually you're going to need small apertures to increase your DoF.
At f/8 your DoF still is crazy thin when working macro so expect to use a lot smaller. I usually range between f/11 and f22.
The small apertures are probably the biggest reason you're going to need a flash, especially if you're planning to shoot bugs and other moving objects.
I have both a tripod and a monopod, however I rarely use them for macro work.
Ok, that's not entirely true, I do use the monopod every once in a while for stationary things.
However I usually find them more of a hindrance then a help as they are big, get in the way, and slow me down. This is especially annoying when hunting bugs, tripods/monopods just don't do it for me there.