Beginner question about SEO & revenue

Hi everyone,

I have (what I feel is) a rookie question, but I don't know where else to ask it.

I started a blog in a pretty competitive niche in November of 2020. I was approved for google adsense in late january and in march I made my first $0.36. On that day in March, I only had 4 page views, 1 impression and 1 click.

Since then, my page views have been steadily increasing but my clicks and impressions have remained zero.

My question is twofold:

1). How is it possible that my impressions are zero if I have clicks?

2). How to start making revenue- or when can I start expecting revenue

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Any input is greatly appreciated. Thank you!