Edit site in php and insert data in the db

HELLO, I need to edit some fields while uploading the property to the site
https://www.valutarerealestate.it/

the display page of the property is this:
https://www.valutarerealestate.it/immobile/axa-piazza-fonte-degli-acilii_409


the required changes are:

add 6 items with a choice between YES and NO:
CAR BOX > YES/NO
PARKING SPACE > YES/NO
CELLAR > YES/NO
BALCONY > YES/NO
TERRACE > YES/NO
GARDEN > YES/NO

add a numeric field
NUMBER OF BATHROOMS

DELETE FIELDS:
MUTUO
RATA
RISPARMIO DESCRIZIONE
PERIZIA BANCA
PERIZIA TRIBUNALE
BASE D'ASTA

edit field text
PREZZO DI VENDITA change with OFFERTA MINIMA (MINIMUM OFFER)

Image management
Insert the possibility to upload up to 20 images (now upload 5 images)


CHANGE MARKET VALUE FIELD.
it becomes a drop-down menu with the option to create a percentage value:
5%
10%
15%
20%
... continue to
100%

(attention, the value printed on the screen in the public area is equal to the value entered in the "MINIMUM OFFER" field + the percentage entered in the drop-down menu.

The calculation of the percentage is calculated as follows:
in case of value selection 20%
in the event that the value of 100,000.00 euros is entered in the MINIMUM OFFER

calculation to do:
100,000.00 / 0.80 = 125,000