The most common way to interact with the fairies is to offer them a gift. This can be in the form of sweetened “food” - honey is a popular offering or it can be something longer lasting, think pretty ribbons, lace or crystals.
The people I know who do mix with fairies have their own ways of doing it but to throw a few ideas at you – one witch hangs small pieces of sparkly fabric from trees to act as little “hammocks” for the fairies. Another hangs ribbons from the low branches of trees. Another collects little acorn cups and fills them with honey, milk and red wine (I’m not personally sure if the fairies drink our wine, I’ve certainly been advised that we shouldn’t drink theirs!) One witch collects the tiny little gossamer bags that many new age shops sell their tumblestones in and makes the fairies a little gift bag of cobweb and quartz shards. Go with what feels right to you but I’d suggest you avoid anything with a metal component as iron in particular is supposed to be quite harmful to the fey.