Welcome to BYC. Do you want to keep the chickens? Do you have any pictures of them? I assume that you don’t have other chickens or poultry? Get a small bag of chicken flock raiser/all flock or if both are hens, layer feed at your farm store. Large bags will probably become stale too soon with just 2 chickens. They will eat some bugs and grasses in the yard, but need some chicken feed. A chicken feeder should be kept dry and under a cover. They will eat from a pan, but keep it from rain. They can drink from a pan, bowl, or chicken waterer. Do you have a place for them to live, such as a pen or garage?
Most birds prefer to roost on a perch. Those can be made from a 2x2 or 2x4 board up about 18 inches to 3 feet tall. If they have been allowed to stay out at night, they may want to roost in trees, but eventually they may be taken by a predator. If you make a coop for them, they may need to be locked in for 24/7 to teach them that is where to sleep so they will return before dusk. A run would allow them to be protected by fencing, and they could come out of the coop into that. They need a box or nest for laying eggs. Most chickens want outside after daylight, and will come inside int the evening.