Best of luck but I would not use a guitar with a mic - I would have a pickup fitted. Also how big the room - how many people are expected and how much room do you have to setup in and how much time to setup and clear down

Are you the only artist or will there be others performing - makes a difference if you have to lug stuff in set up and get the balance right.

I would go and do a few guest spots somewhere prior to gig to test gear out