I don't know if there's a hard and fast rule on capitaliztion with colons, but I only capitalize after a colon if it's a complete sentence. To use your example, "The ingredients are as follows:" I wouldn't capitalize the first ingredient in the list. However, if the sentence was something like...
I'm new to Mythic Scribes and am excited to get started reading through the forums! I'm not much in the way of a writer, but I'm an avid reader - fantasy being my favorite. I also edit and blog in my down time and generally try to find any excuse to keep my nose in a book.
If you'd like a...