How exactly do I go about doing this? Need urgent held

The task is to develop a model that will calculate the following aspects of TVM for a user:

1. Monthly payment (incorporate ability to shift between beginning or end of month)   

2. Interest paid between two months                                                                          

3. Principal paid between two months                                                                                 

4. Balance owing (Settlement amount) at a specified month                                            

5. Initial payment if growth starts at a given point in time (arithmetic growth)               

Consider the growth for the next few calculations:

6. Interest paid between two months                                                                                

7. Principal paid between two months                                                                                

8. Balance owing (Settlement amount) at a specified month                                             

Exclude growth from the following questions.

9. Initial payment if payments are suspended between two periods                             

Consider the suspension of payments for the next few calculations:

10. Interest paid between two periods                                                                           

11. Principal paid between two periods                                                                                      

12. Balance owing (Settlement amount) at a specified period                                                

Design and User friendliness of the model (decent attempt, good attempt, very good)    

Innovation (bonus functionality and approaches)   (little, good, very good)