Hi there Jacko,
Welcome to the forums.
First question: You should use a ? after each question. Be aware, though, that more than a couple questions in a row could be seen as ... well, a bit like an inquisition. (In your example, the "How dare you" sounds like it should be "How dare you!")
Second questin: I'm not sure what you mean, I'm afraid. Do you mean the chapter titles are writtin in all caps? There are no formal grammar rules for things like this, but there are common style conventions. One is that anything written in all capital letters is simply hard to read and should be avoided for anything other than a few words.
Capitalizing the first word of the chapter, or making the very first letter huge, is simply a design element, and there are no requirements for this at all. Please let me know if this doesn't answer your question, though.
Barb