Welcome! Books, lots and lots of books. Gail Damerow has 3 of the best chicken books: Hatching & Brooding Your Own Chicks (which I'm reading now), Storey's Guide to Raising Chickens, and The Chicken Encyclopedia.
Here's my tips:
* Build bigger -you'll quickly become addicted
* Research Breeds -do you want egg layers, meat birds, pets, or a combination of those, do you want friendly chickens (docile isn't necessarily the same thing)
* Know that sometimes chickens do die without it being your fault, but always research a possible reason in case you need to fix something
* Relax and Enjoy your chickens -gain knowledge, but know that some things are just learned by trial and error and what works best for you