Creating an Array from a text file

Hello, this is homework, so I am looking for some hints, tips, resources for putting together a program that reads a text file (First name, Last name, score) and I need to print the information and include a class average and a message if a students score is more than 10 points below the average. I have started a StudentScoresApp, a StudentScores, and a IComparable.

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;


public class StudentScoresApp {

	public static void main(String[] args)  {
		 File file = new File("myFile.txt");
		    ArrayList<String> myFile = new ArrayList<>();
		    Scanner in = null;
			try {
				in = new Scanner(file);
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		    while (in.hasNextLine()){
		        myFile.add(in.nextLine());
		    }
		    Collections.sort(myFile);
		    for(int i=0; i<myFile.size(); ++i){
		        System.out.println(myFile.get(i));
		    }
	}
}	

public class StudentScores  {
		private String firstName;
		private String lastName;
		private int score;

		public StudentScores() {
			firstName = "";
			lastName = "";
			score = 0;
		}
		public void setfirstName(String firstName) {
		this.firstName = firstName;
		}
		public String getfirstName() {
			return firstName;
		}
		public void setlastName(String lastName) {
			this.lastName = lastName;
		}
		public String getlastName() {
			return lastName;
		}
		public void setScore(int score) {
			this.score = score;
		}
		public int getscore() {
			return score;
		}
		
}

public interface IComparable {
	int compareTo(Object obj);
	
	}

1. I am not sure how to get the ArrayList to pass through or use the StudentScores class so I can pull out the student scores and do the average and figure out when a student falls below the class average by 10 points and print format properly the information.
2. I am not sure how to compare the data in the StudentScores class using the IComparable.

Thank you for any advice and help.
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