Once I have a plot idea I write a detailed outline, although it is a series of scenes since I don't know where the chapter breaks go until I am writing. When I know the entire sequence of events I just sit down and write those scenes in the order they happen.
I write every day, but how much varies a lot. I tend to do necessary research only when I get to that point in the story. When I'm in the process I visualize everything that happens - I see the scene then try to describe it on paper.