linking into the purchase page flow

In the sailing school, I have courses and classes for each course. I am selling classes (product) … I can see how the site can do that using a standard template. But after a person selects a class to buy, and adds it to the Cart, I need to intervene and have them fill out information about the student who will take that class … i.e. first / last name, age, parents phone #, email etc. That data needs to go into a collection.

I understand how to construct a write only form to get the data into a collection. My problem is understanding how to link that page in  the correct sequence as follows: 
 select a course 
 select a class for that course 
 add that class to the Cart 
 collect / submit student information (with some of the class information like title, date, etc) 
 pay for the class 

Can I do this without have to add code?
thx for any advice

Hi,
I don’t think you can do that without some code.
What you’re trying to achieve is some kind of configuration on the product, meaning you want to customize and configure the product (class) before adding it to the cart.
I think this example can help you achieve that - https://www.wix.com/code/home/example/Product-Configurator