simple but complicated

I want you to do it at once.

What does the above sentence mean? I think The first person wants something would be done by second person. Am I right?

What is the common/generic name of the given sentence? One may ask with 'common/generic name' what I wanted to mean. So, let's consider the following sentence:

My bicycle got stolen.

This is an example of get-passive sentence. To me 'get-passive' defines the type/generic/common name of the given example.

If anybody understand my question, please, help me to clarify it. I want to learn how to make this type of sentence (I want you to do it once).

Again thanks to everyone.