Pretreatment process for Steel

Hi, I am pretty new to the powder coating industry and i'm getting some bigger clients in day to day.

I'm in the process of getting a pretreatment setup going. My main concern is to setup something that is small at the moment.

I have a batch oven and i need to setup the pretreatment station to do steel newspaper racks for a customer. I currently have the phosphate chemicals to do so.

How does the setup need to be? Example: (1) Degreaser (2) Water Wash (3) Phosphate (4) Water Wash.

Or could i just go to Degreaser,Phosphate, then wash? Or will that contaminate the phosphate?

Any advice from those who have first hand experences in this would be GREAT!