I'm sure you meant ALO interview (an LoA is a letter of assurance). For my son's liasion officers he prepared a resume. He went online and did a google search for college resumes to help him with formatting. Basically what he did was list categories and under each category put down info, include dates as applicable.
Include name address, telephone number etc on top
Objective: To attend a service academy/become a military officer/....... (whatever your objective is)
Educational Experience: He included his school the dates, his GPA, how many AP/Dual Enrollment/ Honors classes taken and to be taken Senior year, AP exams taken and results, SAT scores, overall school rank.
Athletics: dates, sport, letters
Leadership: dates, activities
Employment: Dates, place, duties
Extracurricular Activities: dates, name of activities (and explanation if unclear)
Volunteer Experience: dates, duties
Awards and Recognitions: dates and description
DodMERB: dates and status
Now I'm not saying that this is the right way to do it, but this is the way he did it. Don't make it too long. Have your parents or friends take a look at it.