Don't know where to start, please help

Hi everyone,

I don't know in what order I see which doctor. I went today for the first time to my pcp for the rash under the belly fat/skin. She gave me a cream, powder and suggestions (you know, make sure it stays dry, wear cotton blah blah)
My question is, what do I do next?
How long does one need to "document" and is it correct to document with my pcp?
When do I contact a ps?
Do I/ should I contact my insurance company ( GHI/ bcbs)

You get the picture, tell me about your journey
THANK YOU !!

Take pictures of the rashes as well.  I had over a year of documented rash pictures, visits and prescription records and I was approved for panniculectomy.  I paid out of pocket for corset trunkplasty to address the full torso excess skin. 

I would get at least 3 months worth of documents  when going to plastic surgeon for them to submit with the pictures they take and records.