i do know of some calls and summoning for them, they're packed away somewhere. to me, however, the easiest way to call upon fae is to leave offerings. plant a garden with the right flowers, and leave sweet things. flowers that attract butterflies and hummingbirds typically attract fae as well. i don't work with fae so i'm not sure how long it'll take. i met one once, they're all around us, like spirits, you need to invite them to you i believe.
how to befriend fae i'm not sure, but i'm guessing it's the same as with other beings, be nice, treat it as an equal, leave offerings for it. fae like sweet things, so some honey, or sugar water, or candies works best.