Hi and welcome,
First of all you will need an inkjet printer if you are going to print scans by yourself.
then, you'll have to buy photo paper (satin, mat or glossy, depends on your preference)
next and finally u need (scissor, cutter, cutting board, metal ruler, pencil, bone folder and strong glue for paper)
well.. that's all you need to start making your own boxes, it's simple when you know how to do it the right way and work with patience
however, investing in the good tools makes the job a lot easier for you (like for exemple a printer that can print a3 paper, a creasing machine scoring paper, a professional paper trimmer for a clean job) you can add self adhesive clear film aswell to protect your boxes from water, dust and uv rays or ultraviolet lamps as the colour ink goes over time
There are many ways to create boxes but if you want to make something look more like the original nintendo boxes, you'll need to use grey craft cardboard with a special type of inkjet paper and also calculate both paper weight, the paper should not be more than 300g.
otherwise the website offers some tutorials but you gotta be bilingual for this
anyway, hope that helps.