I need to make a SQL statement using MYSQL

Below are the practice questions, but it's so complicated that I don't know how to code it... I need your help!

1. I need to make a form in a new document "index.php" which takes 4 values: employee id, first name, last name and mail address.
2. I should use PHP for this! Now in a new file "db.php", I have to use PHP with MYSQUL functions to do the following:

• I need to open a connection with my database server (umysqli_connect)
• If the database does not exist, I need to make a new database called Practice08
• And then I need connect to and select this database!
• I need to make a new table Employee_info if it does not exist
• I need to make sure that the input value employee_id from the form is unique and does not already exist in the table! And if it is unique, I nee to add all inputs from the form into the table
• Once information has been entered, my webpage should display a success message!

3 Now I have to go into PHPMyAdmin and verify if the database and table is created and information has been added correctly.

4 I should use PHP document for this! I need to make a new form that takes 2 values: employee id and email address. This form should allow the user to modify their mail address.

5 And then l need to use PHP document for this! In "db.php", I need to use PHP with MYSQL functions to do the following:

• If the employee id entered in the form in Question 4 exists in the Employee_info table, I have to update their mail address to the new mail address input by the user.
• And then I need to display success message on my webpage after the change is made

6 Finally, I have to go into PHPMyAdmin and verify that the change has been made!