Your first boat but do you have boat knowledge?
Inspect bellows, raw water impeller, exhaust to ensure good as these are the typical maintance issue that can result in big $'s is ignored.
Frig will be easy to install and should be dual volt, 12 V DC and 110 AC.
Plenty of folks here with your model that will chime in.
1997 2400 SCR
5.7 Vortec / Bravo 2