Our References and Links page points to a nice equipment guide, but I don't remember it saying anything about helmet care.
The tricky thing with helmets is the darned hardware. It's constantly loosening, probably because of temperature extremes expanding and contracting the hardware.
I repaired a player's helmet today, that inspired me to check ours. Every one had loose screws, and I was missing one. Happily I had a few spares.
I think it's a good habit to tighten all the helmet screws every time the helmet is used, as a part of routine post-skating gear maintenance.
Oh, and skates should probably be sharpened after every 4th time on the ice. A lot of places do a bad job, so ask serious hockey players where they go. We use Boehm's on Selby, we have a sharpening card there.