PC to Mac Mini

You can move your Photos, Music and Doc's over using an external drive, or..... Migrate directly from the PC.

Migrating directly is complicated, see > Transfer from PC to Mac with Migration Assistant - Apple Support

Keyboard and Mouse choices are optional with the Mac mini.

While the expensive Apple ones offer a few more tricks than the others.

Mac compatible Logitech, Macally, Matlas and others work just fine with all Mac's.

Also have a look at > Tips for Windows switchers - Apple Support

Make sure any software that you rely on is available for Mac or if not, find suitable alternatives for Mac.

Also, if the apps you have do have Mac versions, verify that the licenses are transferable. Some software willingly provide a license for one platform or the other. Generally, any software subscriptions are good for any OS that the software supports.

External 1-3TB SSD for the backups with Time Machine, Carbon Copy Cloner or SuperDuper.

+1 @Ozzie - you might also need a new printer if your printer has been discontinued by the manufacturer and/or isn’t fully AirPlay compatible (some of the older printers only support AirPlay for mobile devices).

Make sure that you have a good monitor for the Mac mini , a Apple mouse and keyboard wired or wireless, Mac mini doesn’t have VGA ports to conect any VGA monitor

Applecare ... "don't leave home without it."