Letters of Recommendation Question

[Peaches-n-Cream]

I am in the process of writing a college letter of recommendation for a high school student. I have never done this before, and now I am stuck. I have written that the applicant will be an asset to college and reasons why. I'm not sure if this will suffice.

I have searched online for examples of letters of recommendation, but I have not found anything that applies in this case. I would appreciate any advice or suggestions that you have. Thank you very much for your help.