I would like to have lower monthly payments should I make a big lump sum payment towards my principals and ask my mortgage company to adjust it or refinance it or which one is the best ? 

Seems like it's in a lower end area so if it is filled you will have tenant issues and turnover cost.

If I have lump-sum free cash, should I just apply it to my mortgage to recast so that my monthly goes lower?

Some of the costs quoted shock even seasoned flippers as they are lower than even material are in many markets. 

When you researched markets like Austin las Vegas Miami, those markets have higher land cost and are more cyclical in nature tend to have larger price swings compared to regions with lower land costs.

Airbnb listings (newest to oldest)(Hit a snag in lower reviews haha I promise I'm a great host): airbnb.com/h/familydelightairbnb.com/h/homeoasisfloydairbnb.com/h/sereneoldtownsantuary@Sarah Kensinger@Ika Sargeant Well done.  

I'd assume all vanities, lower cabinets, 3to 5ft of drywall and base will all need replacing. 

That seems like a lower demand area than any place I would ever invest.   

I have lower-end property in a small town.

Your main concern should be whether these bedrooms and bathrooms on the lower level are legal and have the proper egress require for fire code and livability.