Asking for a friend; Getting house rent ready

[Jarrid Perusse]

I bought a house 2.5 yrs ago near DT Orlando, house is a 2/2 & 1/1 duplex, and up to now I have mostly been renting it out to friends as it is also currently my primary residence. That being said I am ready to move into something different and rent out the house entirely. There is some repairs/upgrades that need to be done as well.     

My question is about determining what is worth spending money on for the best value & budgeting how much to invest in?  Any guidance or metrics I could evaluate would be most helpful!