Sussexgal, that was a really good post.
To the OP:
This is the perfect place to get all the practical advice you need about raising chickens. I'm glad you're here!
You could always start small, with plans to increase the size of your flock as you learn more and see additional breeds you want to own (which is unavoidable here...some people have the most beautiful birds!
). If you do that, just build a large coop and have a few birds (5-10) at first. The coop construction section is the best place on this site to get information about building your coop.
Before you go out to buy some chickens, do your research. Find out your local ordinances and make sure you can have a rooster where you live (if you can't, you can still keep chickens and they will still lay eggs for you). Like
Sussexgal said, you need to think about what you want the chickens to do for you and what you are looking for in a chicken. (Yes, picking out a chicken breed is very similar to picking out a dog in that you have a lot of characteristics to consider). Some chicken breeds are better at laying eggs, some are friendly, some are flighty and standoffish, some are better for cold climates than others, etc. You may also want your chickens to have a particular "look".
This page is a good place to start just to begin thinking about what breeds you might like to keep:
http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html
You can order your birds from a hatchery or get them from a feed store. Feed stores will have less variety; they usually only have a few different breeds of chicks at a time. It's really up to you which way to go. With a hatchery, you're more likely to get the sexes you want as you can order them by sex. This site is a great place to ask about various hatcheries and see which ones are worth ordering from, and know what to do to plan for the arrival of your chicks.
I think that's all the information I'll share with you for now. I'm sure within a few days, you'll be posting all over the forum with your questions. You'll find the folks here friendly and helpful. See you around the forum and welcome to chickens!