PAPER MAKING
Search for homemade paper tutorials online! You can use paper-based materials you find around the house to recycle into homemade paper. The tutorials you find, like the one below, show you how to make the screen/netting you need, but you can also purchase it online by searching for paper making mould and deckle.
You can also play around with different materials in your house to make a screen and with dyes to change the colors of your paper pulp!
PAPER TREATMENTS
You can also do creative treatments to existing paper, like water marbling. Let yourself go down a Youtube rabbit hole of watching suggested papermaking/paper treatment videos to find new crafts you didn't know existed, like ecoprinting with plants, paper weaving, and stamping.
If you need materials or tools you don't have, try searching for alternatives online. For example, the water marbling video below mentions using a "surfactant" but if you search for alternatives online you'll see that you can just use dish soap!