Yeah, you can.
If you have a set amount of stuff right now, that will only make you so much money, assuming you find someone willing to pay what you want for it.
To really make a sustainable business selling it, you need an ongoing way to collect or create new memorabilia or to have a way where people bring stuff to you, that you buy, then turn around mark up and resell. If not, you are just turning what you have now into x dollars and you are done with it.
You could either do a old fashioned brick and mortar store, or do it all online with your own website or just use eBay.



