Well, there's no mandatory pre-set way of doing things, but a very important "detail" is that you need to remember your villagers needs haven't changed.

So you still need to focus on a steady supply of food at the start, and the health issue is usually a sign that your people's diet isn't balanced. It's a super frequent issue when you are using watery type of maps and using mostly fishing / water scavenging to get food at the start, and end up with everyone on a strict proteins-only diet. The herb grower and herb mender can help you a bit in that case, but you need to find a way to add veggies / fruits / grains to the diet.
Or the other way around, you start with farms early and end up feeding everyone with beans and carrots and then keep getting veggetable seeds. Your villagers are then stuck on a veggies-only diet and lack fruits/proteins/grains.

Basically, my recommendation for a CC start would be the same as for a basegame start: Get a Gatherer and either a hunter or fisher or water scavenger going for food variety (you'll only lack grain), and then have fun with all the CC options!

Another big thing is log supply. A lot of things use logs in CC. Using Firewood as fuel is far from the most efficient. If you're on a watery map, reed bundles (dock buildings) might be a better option to let you save logs for other stuff. The other option is to go for the Stacks Burner building to make charcoal from the logs instead of firewood. You get a lot more charcoal than you'd get firewood, so you save a lot of logs that way.

Then there's also the fact that the iron you get is Iron Ore, so you'll need to get some smelting started (and making furnace fuel before you can smelt) in order to get your smithies to make correct tools and not just rough ones that break early.
(There's a display error by the way. People using any kind of tool that is not Iron will be shown as using "steel" even if it's not what they have. The correct durability of what they have equipped is applied though, so tools will break fast if people pick rough stuff from storage, even though they proudly say they are using Steel stuff. They're silly like that :p )