In my Year 10 English class, we've been taught to begin an analysis with and acronym going by the name FACTS.
F - form (what kind of literature is it? A speech? A narrative? Persuasive article?)
A - author/audience (address who it was made by and who for)
C - contention (what main point it wanted to make <- consistently refer back to this throughout entire analysis)
T - tone (how was it written, how would it sound if it was expressed verbally, how does it treat its audience)
S - style (bit more abstract and vague of a term, but basically is what perspective it prefers to take, whether that be expository, persuasive, descriptive, etc.)
When writing an introduction, you don't necessarily have to address it in that order, but covering those five points is a good way to make a sort of checklist for what you have to establish.