When do I start feeling the effects of Botox?

I've heard that you should start taking care of your skin by getting Botox in your 20s, and since many people around me are doing it, I've become interested and am looking into it.

I've heard that getting Botox refines your facial lines, but I'm curious when the effects actually start to show.

I also want to know if it shows right away, or if it takes some time or a few days to settle naturally.

Also, I'm a little worried because I've heard that facial expressions can look awkward after getting Botox, but I've heard that technology has improved these days so the results look natural.

I'm also curious to see how satisfied people are in reviews from those who have tried Botox for the first time.

I would also like to know the duration of the Botox effect and the injection frequency. It is a burden for me to have to get it too often.

I'm considering getting Botox for the first time, so please share some information if you have experience!