Your situation sounds close to mine. Sold my last boat 28 years ago. Navigation
offshore was a Plath, HO249 and paper charts. Guess what. That will still work just fine.
If you want to join the 21st Century it's fun and saves a lot of time but I would keep the old tools along as backups. There are those that depend exclusively on electronic charts, I'm not one of them.
How you participate in the new electronics
will depend primarily on budget
and then on preferences.
Cheapest. Small GPS without electronic charts. Plot lat/lon on paper charts.
Next. Chart plotter/GPS with electronic charts. Can go with handheld units with small screens for a few hundred or built in units for hundreds to thousands.
Top. A multifunction, integrated system with displays in the cockpit
and nav station. Will show chart and location with radar overlay, speed/depth/wind, send data to the AP and fix coffee in the morning. Bring your big wallet.
Charts. Not cheap
but I think similar to buying a full set of paper charts (ocean, approaches, harbor, etc) for the same area covered by an electronic chart set, typically a $300-$400 per region in the US. I did start adding up the cost of a full set of charts to cruise
UK and the med and stopped counting when I hit about $4000.00.