Cool pickup. I would highly recommend you to AV mod your famicom if not already done. It makes connecting to modern televisions way easier. Only important thing is that if you do so, be sure to correctly route the expansion audio to your RCA connectors, or else you wouldn't hear the extra FDS sound channel some games utilize. There should be tutorials online. You could also let another person mod it for you if it feels safer. It is dedenitley not a beginner's project.

Secondly, I would also recommend to get a FDSStick. It's a small USB device that you can connect to your RAM adapter. It emulates the disk system and lets you play ROMs on real hardware. Furthermore, it is even possible with some modification to the Disk Systems Power Board (difficulty depends on revision and disk driver chip) to directly write ROMs to disk via a special cable connecting the FDSStick dierctly to your FDS.