RTFM!
Honestly they're not hard to use.
The Garmin manuals are really good.
The BlueCharts are your standard NOAA (bought by Maptech) charts, so you'll have all the same data you get out of a standard chart.
I'm not overly impressed with the BlueChart format, I prefer the Maptech BSB's and CMAP vectors, but the Garmin unit can't use em. They're mostly used with laptops with nav software. But for what you'd end up using em for, they're fine.