I don't have a citation handy, but the general usage that I see is:
Bullet and number lists do not end with a period or other punctuation unless it is a complete sentence, except that a question mark or exclamation is used when appropriate. And bullet lists should rarely include complete sentences.
The first word in each entry is normally capitalized. When the entries look like titles, they may use title capitalization. (i.e. the first letter of each word capitalized except for articles and minor prepositions, etc) The only times I can think of when a bullet list does not have the first letter of each entry capitalized is when each is just one or two words.
Example 1: Very short entries, no need for capitalization
Animals in the zoo include:
Things I do every day:
Get out of bed
Go to work
Go to bed
Example 3: titles
Topics to be discussed include:
Saving the World
Saving for a Vacation
When to use title case and when to just capitalize the first letter is highly debatable and subjective. If the entries are complete sentences, you should definately not use title case.
Most important, be consistent. Don't make half the bullet points full sentences and half just one or two words. Don't capitalize one and not the next. Etc.
I'm reminded of a lecture I once attended on writing style where the speaker had a slide on the importance of consistency with three bullet points, labeled "1.", "B.", and "Third".