All titles will always be capitalized.
Only if it is at the front of the sentence.
When it directly precedes a name. For example: President Barack Obama.
yes, it's a title, so it's a proper noun
If an is the first word, yes. Otherwise no.
The first word in a title is almost always capitalized. As a general rule of thumb, you should capitalize proper nouns, acronyms, and any word containing four or more letters. Of course, there are...