How to write about an area I'm going to study in undergrad research?
In most of these situations, a large part of the "exercise" is for you to grapple with the writing of that document yourself, thinking about the various aspects.

It is to be expected, or even hoped, that you feel you are unable to do this, due to lack of information, and lack of experience.

Then, talk to your advisor for hints and advice, and show them what you have written, _in_your_own_voice_... as the starting point for further progress.

That is, there should be several/many iteration cycles in creating the document, and, yes, you certainly do need your advisor's help... but in refining and redirecting your own thoughts and preferences.

Good that you recognize that you don't really know what to do, having had no experience at this, but a large part of the experience is to try to do a thing you've not done before... and partly fail, get help, fail less, get more help, fail less, rinse-lather-repeat. :)