Gym Membership

[REDSTAR81]

So I am quite new to Java and I am looking for any pointers. I need to write a program to devise the membership of members to a gym.

Need to work out cost of new members-this depends upon a level of membership
Need to add a yearly cost to all members
Need to add a joining fee

So far this is what I have

import java.util.Scanner;                       // user input

public class Gym
{
    public static void main ( String[] args )
    {
        //  define constants
        final double generalmembership = 100;      
        final double studentmembership= 55;
        final double undereightmembership = 35;
        final double COMPETITION_FEE       = 10;        // fee all members pay
    
        //Input Variables 
        char type; // 'G' General membership or 'S' Student membership or 'U' for Under eighteen membership
	
        //  Set up for user input
        Scanner input = new Scanner( System.in );
        /********************************************************************/

        // Read Inputs
        System.out.println ( "Please enter major ('G' for General Member, 'S' for Student or 'U' for Under Eighteen): " );
        type = input.nextLine().charAt(0);
        {
            //Cost of Memberships
            If (type == 'G' || type == 'g') {
                type = 'G';
            }
            else if (type == 'S' || type == 's') {
                type = 'S';
            }
            else if (type == 'U' || type == 'u') {
            }

            //Calculate membership costs

Any pointers/criticism is welcome as I am here to learn and develop