Sb600 good for portraits? (I have d3000)?

I did some research on flashes a few months ago and I remember reading a lot of things saying that the sb 600 was not compatible with a nikon d3000 as an off camera flash. It lacked some kind of cell thing. (I want to use a trigger I think). But now that I have some money I'm reading that the sb600 is totally fine. I want to do portraits.

I don't know. I really want to buy a flash… And a stand as well. I'm sick of not taking good pictures.

So would it work for me?

Yes, it would work for you. If you can possibly afford the SB-700, I would rather see you buy it than the SB-600.It is So much easier to use, especially as a remote.

To help your portrait lighting with a speedlight, I would recommend using some sort of diffusion. The diffusion dome that comes with the flash is a good start, but I have been happy with Peter Gregg's "Better Bounce Card," available direct or from Amazon. See my demo here

Sure, it would work.
Have this link;
http://strobist.blogspot.in/2006/03/lighting-101.html

If you can get the sb800, the flash is more powerful than the sb700 and it can be use as master in case you buy another sb600, sb700 later on. You can also make the sb800 fire (su-4 mode on the sb800) with your pop flash (the flash power has to be set manually, no big deal, my rule is 1/4 power then I adjust the value if I need less or more light)

You can google those type of light (or look for them on youtube/vimeo) to learn more about how to set up your light for portrait;

-Rembrandt
-Butterfly
-Split light
-Broad light
-Loop light