Are you using a Mac? If so, there’s an app called Pi Baker which is GUI driven. Afpytter loading the image, put the SD card into the RPi and connect the RPi to the printer’s USB. Connect the USB camera to the RPi. Plug in the microUSB into the RPi for power.
If all goes well, you should be able to type http://octopi.local into your browser and connect to the RPi running Octoprint. It should prompt you for a new admin username and password.
You’ll need to get into the settings menu, and setup a printer under Printer Profiles. Add a new profile and input the dimensions of the Mini’s print bed. Save, and put click the Star.
Exit out of the settings menu, and click Connect. Upload a g-code, preheat the bed and extruder. When the temps are reached, click Print. Once you get the hang of it, set the print to wait for the extruder temp to stabilize for a bit more automation.
Post back here with questions.