Preparing my rental for Hurricane Irma

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Help! (please) 

I have a two story duplex that has old windows located in Tampa, one of the windows has a small crack and with 185mph winds, I'd rather prepare for the worst. 

Should I put up plywood board or corrugated metal sheets to protect the old windows (house was built in '84 and has original windows)

Regarding upstairs unit what precautions should I take when finding someone to put up the board or metal sheets? What's a reasonable price? or can someone recommend someone who can help me out? 

Any tips on where to even find the materials at this point? 

Thanks BP!