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The simplest is to use something you have on hand, at least on a temporary basis. There are a lot of good suggestions throughout this site. The 5 gallon buckets are a great idea and you can usually get them for free at a deli, a bakery, a restaurant, or a grocery store that has a deli or bakery. You can use a box, a cabinet, a sink, about anything you can find. If they can, the chickens will perch on the edge and flip it, so it needs to be stable.
For full sized birds, the nest needs to be a minimum of 12 inches square. 14 or 16 inches is better, but chickens are adaptable. Some people use community nesting boxes where several hens can lay at the same time.
The nest needs a lip across the front to keep the eggs and nesting material from being scratched out by the hens. 6 to 10 inches high is a good height.
The top of the lip needs to be at least 12 inches from the top of the litter or floor, but more is better. If you have heavy hens you might need a perch or something for them to use to get to the nest if you make it more than 24 inches. The reason to have it up higher is to keep it cleaner. The hens will scratch the litter and poop from the floor into the nest if you don't.
You can put an egg in the new nest to show the hens where they should lay. Fake eggs like the plastic easter eggs or wooden eggs work. If you use a real egg, mark it so you will know which is not fresh. Once they learn where to lay, you can remove the "nest" egg.
You need a perch higher than the nesting box so they will not roost in or on the sides of the box. That keeps them from pooping in the nest as much so your eggs and the nesting material stays cleaner.
The experts say to use one nest for every four hens. The idea is that the more hens that use the same nest the greater chance of them breaking an egg by accident while they are getting on or off the nest. However, many people will tell you that their hens will line up to wait for a popular nest while others are empty. I don't have any good answers on that. The hens are looking for a nest safe from predators, so one nest may seem more secure. They tend to like a darker, closed in nest. Maybe they see a hen using it or a "nest" egg already there and think, "If she thinks it is safe, it must be". Once they get used to using a specific nest, they will go back to that nest.
I haven't kept chickens since I was a boy on the farm many, many. many, many years ago. Yep, more than forty. I've got my chicks ordered to arrive the end of April. Some of the above is from memory but a lot is from this site, other web sites, books, or magazines. I'm learning a lot from this site. As a note, you can check out good books or magazines from your library that really give you a lot of information.
Once you get it set up, post a picture and let us know how it works or what you did to get it to work. We all need to keep learning. And include a shot of your chickens. People like to see them.