whatever you like
I like apple pie. Can you make me one?
now I need help in making the steppers controlled via PC, so ideas and help how to make an application that has speed and direction control for the 2 steppers and how to program and connect the arduino to it and control it in real time
Think about what the sending application needs to send. I see that it needs to send motor number and number of steps (positive or negative) for each motor. Depending on how often it sends data, the number of steps can be anywhere from two characters (-2 is two characters) to 6 characters (-32000 is 6 characters). With motor numbers and delimiters, you might be sending 19 characters per set.
If you always send data in the same order, you could get by without the motor number and delimiter, cutting the maximum number of characters down to 15.
Send more often, and the number of characters could go down.
How to develop the application on the PC depends on what crayons you have in your box.