Display product list in custom module like in a category - Prestashop 1.7

[Carpe_diem]

Hi guys,
I am currently working on a custom module for Prestashop 1.7. My goal is to display a product list where the each product has an add to cart button, the products combinations as select list and a textarea that they can add if the want send additional information. 
So far I can retrieve products (name, description, price, ...) with this:

  $id_category = 42;
        $products = Product::getProducts(Context::getContext()->language->id, 0, null, 'id_product', 'ASC', $id_category);

I don't have a clue how can I add the products combinations as a select option and add a custom textarea so for customers to send additional information regarding the product.

Could someone please help me or guide me to get this working.