Sonia,
I think you will be a little unhappy with leghorns to start out with. They aren't the sweet birds most chickens are. A lot of stuff tends to upset them.
If you want really good layers that are a more easy going bird, I'd look at Red and Black Sex-links, RIR's, Barred Rocks. I love the Easter Eggers, the green eggs are cool.
My biggest mistake starting out, was I took whatever was available without studying out the breeds. I found that I really like variety in my coop. They are so fun to watch but I like lots of different colors. I'm starting to add different ones as I learn more about them.
I have a couple of Sliver Lace Wyandottes that I'm going to rehome soon. They get picked on by the other chickens, they are really flighty farely poor layers and they make a lot of noise.
You will learn lots about chicken with time. Find out what you like what you don't like. But I'd try out several different breeds before sticking with just one.