Create a temporary table with identity column

I am planning to create a temporary table with an extra column(Id) that will generate a number sequentially when new data is added

The column Id should maintain order for the insert logic ie, Id should increment each time an insert occurs. I also need to retrieve data from the table according to the order of Id. How do I do that?

When creating the table set NUM as an IDENTITY field

CREATE TABLE #Table (
    NUM int NOT NULL IDENTITY(1,1),
    FirstName varchar(255),
    LastName varchar(255)
);

Now insert leaving NUM column (it will automatically increment

INSERT INTO #Table (FirstName, LastName)
VALUES
('A', 'B'),
('C', 'D');

Gives: