On this site, you'll find art for both printable paper miniatures and tokens for virtual tabletop (VTT) software for Role-Playing Games.
You can find miniatures under the Browse tab, where you can use filters to find exactly what you need, or on the Minis By Source tab, which lists statblocks organized by their original source (such as a book or PDF).
The Progress tab tracks the completion of each source.
To use the printable minis, you will need a base. These are standard for many board games and can be bought cheaply or 3D-printed. A quick web search for "paper miniature supports" will provide alternatives. The image below shows an example of 3D-printed bases:
I am currently working on paper-based alternatives for bases and will add them here soon.
Next, simply download and print the miniatures. Any color printer will work, though I recommend glossy photo paper for the best results. Finally, just cut, fold, and insert the minis into a base, and you are all set!