I wish I would have known:
1. Portable coops are not portable from a practical standpoint. The ones large enough for 6-8 birds tend to be too heavy to move regularly. Our "portable" coop is now relatively stationary, only moved 2-3 times/year, and surrounded by a large, fenced area.
2. An automatic chicken door is the next best thing to sliced bread!
3. Don't start with too many birds, as this substantially increases expenses and labor (e.g., larger/more coops, feeders, waterers, fenced areas, coop cleaning, garden damage, poop on lawn, etc). A flock of 6-8 hens is plenty to supply a family of 4 with eggs. Along these same lines, don't opt into "free extra bird" offers or "males added for warmth" when ordering baby chicks. Stick to the desired number of HENS that you will need to supply you with eggs.
4. The flock typically needs to be replaced every few years with new birds, as productivity from older hens drops substantially. It's difficult to do this when you've named your hens and consider them faithful, breakfast-producing pets!