This is my analogy of MY writing process. I am confident that many of the "experts" would take me to task since I am a bit of a "pantser" (flying by the seat of my pants). Anyway--here ya go:
Let's start with "plotting". For me, I have the idea in my head. The more I think about this idea the more vivid things become. It is as if I am picturing a house I want to build. I know where the foundation will go and I can see the finished product with its roof, windows, doors, shutters and even shrubs. But, I have not been inside that house nor have I painted the outside. I still have to install plumbing, heating, electrical, cabinets, sinks, decide on colors etc. That's what it is like for me when thinking the story through from beginning to end. Where and how all of those necessary parts and pieces will fit together I do not know. It happens as I write and there are many changes that continually take place. By the time I have actually finished I have re-constructed that "house" many times before I even considered moving in.
As far as the characters are concerned, (the people living inside this house), you have to get to know them quickly but only enough so you want to know more about them. As I write, these folks develop and sometimes even I am surprised when I find out who they really are and what they are capable of. Actually, it is the same as meeting real people. Sometimes you may meet someone and become life-long friends. Then there are those who initially impress you but you find out soon enough that they are trouble and you quickly distance yourself. But, you never know that immediately.
As far as dialogue: I try to write just the way people speak. I use slang ie; "ain't got" or "I dunno" depending on the character speaking. I also try to dialogue interaction where there is a minimal amount of "he saids" and "she saids." I try to do it in such a way that the reader knows who is speaking even though you are not saying who is speaking. That can be a bit tricky at times but I think it is important to do. Also, try to avoid long winded dialogue and speeches. Get it done in one or two sentences if possible.
To finish up let me just say that, as a writer, I am a work in progress just like my books. I am not too concerned how big or how fancy the house will be. My goal is to build something well crafted, durable and long lasting.