Clearwater, FL in-law suite upgrades question?

[Wayne Fung]

Hello guys, wish all the best. I am an investor in Clearwater, Fl from NJ, one year ago, I purchased a property in Clearwater, I surprisingly found out there is a large garage in the backyard have existing plumbing and electricity in it, also I can tell the previous owner have already turned the garage into two bedrooms in-law suite, but they cover all the things up for selling process, so I wonder 

1. if necessary to invest more money to upgrade the garage into an in-law suite, so I can rent out to one or two tenants for extra cash 

2. Also, if any contractor for recommendation, finding a reliable contractor in Clearwater will be really hard.

thank you so much