Good Morning-I dont flip but I can tell you there are times to skimp and times not to.
For wood floors, steam clean them and put on rejuvanate (about $16/qt at home depot) which lasts about 6 months or mop and glow (which lasts about a week) to make them clean and shiny, if you really can't afford to have them sanded. If you have a little more money ask about having them screened. It takes off the surface of dirt and you can just nicely put poly over them. A couple hints:don't try to sand floors yourself...you can mess them up forever and most do.
The tenants you get will be a direct reflection of how well you present the place. I fix to the max and often do staging to help present a property in its best light. The secret of the landlord business is having great tenants and the way to get them is having great property.
Look at your budget...this is a business. You need to think through the whole picture...before you start. That you are caught reevaluating your strategy for this property tells me you didn't do enough homework before you bought. Learn your lesson. No matter how successful, none of us has unlimited resources so taking the time to plan carefully and w isely is critical to your success. Good luck