Is Botox effective?

I am considering getting Botox. Can I expect natural results even if it is my first time getting it? I am a little worried that my facial expressions might look unnatural after the procedure. I am also curious about when the effects start to appear; how long does it usually take to notice a change?

Another thing I am curious about is the duration of Botox effects. I have heard that there are individual differences, but I would like to know how long they typically last on average. Are there any specific care steps I should take to prolong the effects? For example, are there any behaviors or lifestyle habits I should avoid after the procedure?

Lastly, I am also curious whether resistance develops with regular Botox injections. Overall, I would like to know about the effects and duration of Botox, along with precautions before and after the procedure.