WordPress and PHP expert needed

Examples:

On the website, we have 2 products (AKA tours or programs) available that clients book (buy, reserve):
PRODUCT 1
PRODUCT 2

So, if a client will like to book a PRODUCT 1.
On the product page:
The client will select the date and number of persons. The system will show him immediately the total prices to pay, it will be according to how many persons will be.
The client will have the option to chose to pay just the booking fee or the full amount, before placing the order.
When all is as the client wish, he will place the order hitting the “Booking button”.
On the checkout page:
The client will fil step 1, as described in step 1.
But on step 2, we only need for each client that he choose on the product page (before placing the order) the following info to arrange the booking:
Name:
Date of birth:
Nationality:
Gender:


But, if this client will like to book a PRODUCT 2, we will need also the system to ask him on step 2 for all from product 1 plus the following:
Footwear
Clothing size
Insurance
Emergency Contact
Health Declaration

This is what we will like to define when we set a new product (AKA Program or tour) or whe we edit one.

That's it