OK, so you'll need MPLAB X and Microchip XC16 installed. Both are easy to find on the Microchip website, and are linked from the
Explorer 16/32 page.
Personally, I'd start with the supplied demo code. Its got a folder for the PIC24FJ1024GB610 in the zip file, and if you unpack that to your MPLAB X projects folder it should work immediately 'fresh out of the box', using the PKOB onboard programmer/debugger on the Explorer 16/32. Your Real ICE may well offer more debugging features and faster debugging, but its advisable to keep it as simple as possibly untill you have the board up and running with your own code.
Once you've got that going, you can hook up an extra USB cable to the micro-B port of the on-board MCP2221A USB to UART interface, and populate J37 and J38 to connect it to the PIM and start developing your serial comms code. You will need a terminal program on your PC - if you don't already have a good one,
https://realterm.sourceforge.io/ is strongly recommended.
Pay particular attention to Rstofer's comments below - he's given you a roadmap for getting the UART going.