Project based on Magento... V2

Hi there, Need some modifications for a Magento-based project... 1/ passwords of choosen accounts should be changed automatically after 2 weeks. an email must be sent to the admin to inform him that the password of the choosen account has been automatically changed 2/ some products have the possibility to be hired, so I need a booking system : - customers can put a reservation for the day(s) (the period) they want (if there isn't a reservation already), they receive an email which confirm the reservation of the product - and in the admin panel, I need a page which list all the reservations, and I want to be able to delete reservations, put a reservation, etc. 3/ I have pdf files to download in my products pages like user manuals (> text attributes which contain pdf path on the server + php code for the products pages). In the admin I have a dtree system which allow me to "browse the server", then find the pdf file, click on his name, and the path is added in the box of my text attribute. Currently the JS is very slow, because there is about 10GO of files to index, so I need a "load on demand system". 4/ Il already need something : keep the current image system in the admin (to add pictures of products) but with the ability to search for pictures on the server, not on the computer, with the same dtree system than for the pdf files (+ the ability to have a view of the images to know what is the one to chooose)