Hello Wiccedbug22.
Welcome to BYC.
If your only goal is to get eggs cheaper than you can buy them then my advice is to give up chicken keeping. It can be done but you need so many factors to be right.
You don't mention which breeds you have. This makes an enormous difference to how well they will fare as free rangers.
While EggSighted4Life is about right with regard to acerage per bird, what's in that acrerage is equally important.
Where you are in the world is also important because climate has a big impact.
The provenance of your chickens has a major impact. There is a world of difference between a Leghorn bred from a semi feral Italian flock and one you might buy from a hatchery.
How your flock is set up is important. Having at least one rooster, preferably more if your flock is over say three or four hens makes a difference.
The type and number of predators makes a massive difference.
I keep a number of tribes and it's taken almost a decade of adjustment, the occasional nervous breakdown, grave digging, learning about sicknesses and injuries, fetching them out of the trees at night, observation, experimentation, nest hunting: the list goes on.
I do this in part because it's my job , but mostly because I love chickens. That is probably the best place to start; you need to want to keep chickens for the sake of keeping chickens. Eggs, meat, company, entertainment, are all bonuses.
I have three tribes currently, I've had five in the past, all free ranging from dawn to dusk. I have twenty two chickens currently, six of which are roosters. They have a coop per tribe, plus sick bays/maternity units which if I'm lucky most will use. The climate here is temperate and ground predators minimal. The forage is fair most of the year ranging from crop fields, woodland, a couple of compost heaps, not to mention donkey middens and sheep droppings, all year round fruit fall and a wide variety of vegetation. I still feed them commercial feed three times a day.
I believe after ten years about half of them could survive on forage alone and be quite happy living in the trees. It's taken from three to five generations for them to progress from standard backyard type chickens with good genetics to confident, semi feral hooligans.