Virginian needing help

Bought a trailer for so much more than I should have. Learning the hard way. I tried selling and seems like there is too much work that needs to be e done. I've decided to hire someone to take care of some things in the hope of trying to resell or move forward with my own business. What kinds of floor (stick linoleum is there now) and walls do I need to install. The walls look like regular house walls maybe. I also need to add a serving window. There's a huge cut out already but plexiglass glass is there as a "window ". Any help would be greatly appreciated.