Received an Amiga 500 today, and have questions.

[Boing-ball]

Further questions: what's the best way to adapt the RGB out to an HDMI monitor.

There are powered SCART to HDMI boxes for sale on EBay that will do that for you. You also need a a 23 pin + Phono to SCART cable for vision and sound from the Amiga to the powered SCART Box. Also a HDMI Cable.

I think Amigakit sell the RGB to SCART cable. But if not try Retro Computing Shack on Ebay:

https://www.ebay.co.uk/itm/254623532468?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=47HsXjQYSm6&sssrc=4429486&ssuid=udhysnkvtsy&var=&widget_ver=artemis&media=COPY

For The SCART TO HDMI BOX:

https://www.ebay.co.uk/itm/394566981499?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=orHtcey-RXe&sssrc=4429486&ssuid=udhysnkvtsy&var=663115877415&widget_ver=artemis&media=COPY

[Boing-ball]

You may need to clean and re-grease up the drive spindle etc. whilst you are at it. The grease I. The drive has probably gone hard making the head movement stick when reading across the disk.