I had them for a few years as a teen and when I got back into the 'hobby' later on in life I just went completely dumb on day when I walked into
TSC. Wanted to get back into it, just should have waited a few weeks and 'undumbed' myself first.
A amusing list of some of the things and conversations I've had with myself while freezing outside, hunched over with a chicken on my back shoveling poop and collecting eggs while methodically swearing and staring at my flock as they judge me;
1)
Ventilation 
2) Should have built a
walk in coop idiot, now my back hurts and its awkward.

Some of my chickens take me hunched over as a 'new and exciting roost to check out' and poop down my jacket.
3)
Do it today, not tomorrow. Learned the hard way. Chickens don't do well with procrastination, but sickness and predators do. (Sorry kids, I'm still guilt ridden years later)

4)
Do the research
...so much hogwash and gimmicks to be found online and in the words of people who don't have any idea. Find and get to know people that actually have experience and wisdom on the subject, even if its not what you want to read or hear.

They'll be your chicken best friend and you'll sleep better at night.

5)
DO NOT rear chicks in your bedroom because you think its cute! EVER.

I mean its OK if you like a layer of silt, dandruff and dried poop coated nicely on everything you own even a year later I'm still finding pockets of it.

6) Learn to
SAY NO to yourself and more importantly...your feather babies.

(Its so hard!)
7)
Do Not Join breeder groups because you think its a fun and open community. Its very one way, linear and some other things that really left me with a huge distaste for the entire idea of some breeds I really loves for a very long time.

Its VERY OK if my chickens don't have pedigree toe nails, doesn't make them any less than amazing.