Mostafa Hashem

I need to create an extra step before the order being created All i have to do that when the customer click on checkout moves to another form to collect more data and once this form validated and data saved will be move to checkout step the customer must fill this form data to continue the process to create the order i have started by using hooks but i didn't find any one used for pre checkout and how will move to a module to handle this what is the best solution to create this form and move forward next