It is fundamental that you understand the difference between manufactured and mobile homes. Manufacture homes are light years away from mobile homes. I am talking about a new home, which will be built in a factory and then set on its foundation on the lot.
The first thing that happens is to acquire the land, which is zoned for residential use. Then, to go to the local government, city, county, etc., and obtain permits to place a new manufactured house on that land. That is not different than when you apply for permits to build a house. Once permits are obtained, the factory builds the house, while the site is being prepared. Grading, foundation, utilities are brought in, sewer, water, electricity, etc. Just as it would be done with the construction process of any house. Then, the house comes off the factory's production line and it is transported to the site and set on its foundation. All utilities and services are then connected and everything is checked to make sure that everything works. Then a city inspector will inspect the house and make sure that everything is there, water, electricity, heating, etc., and a certificate of occupancy will then be issued.
There is not such a thing as a "conversion process." There is no conversion from one thing to another. These are houses, just like any other house, the only difference is that they re built in a factory, under a controlled environment, in most cases these houses are better
built than site-built homes.
Let me know if you have more questions. You need to check local laws and requirements with your City. Good luck.