Add fields that the customer has to fill before adding to cart (1.7)

[Vintzs]

Hi everyone,

I discover prestashop (1.7) and I don't know the way of doing what I need.

I want to display fields on the product page (at the combination place, for example).

The customer has to fill in these fields before adding the product to the cart.

I need a text field (so, not possible with attributes) and a dropdown list, which depending on the choice made in the list, either displays a new text field or adds another product in the cart.

If you could tell me what to use, it would help me a lot.