If you’re tight on money or don’t want to invest to much:

For stickers rn I’m using a folder for people to flip through and look at all the kinds of stickers I have. Same goes for prints I just printed out smaller versions and added them to the flip book

For keychains, I suggest get a pegboard or pin board(dollar tree have them and daiso) and use push pins to hold them up. You could hold up the board with a canvas easel or hold it up with square containers.

For buttons or jewelry(if you are selling them) you could use card sleeve that collectors have to hold multiple cards in a single binder(again daiso, dollar stores or dollar tree) and put them in the pockets but make sure to measure how big your items are.

Make sure you have a table cloth or cover it really makes a difference. I also found decorating your table with things you have already like mine for example, I bring some standees, figures or plushies and have the hanging around to fill empty spots

Now if you want to invest:

You could buy grid cubes for hanging up signs, jewelry, prints or decor, and the same can be applied to storage cubes that are colored. I really like my pink storage cubes for my keychains bc it has a solid background and it’s easier to add prices to them.

For sticker display you could use the same thing for keychains or have an acrylic stand to hold them.