Edit PHP - MYSQL website

i have already website and i want to develop it and add all these changes i will provide the website to you after checking the offers about the website it's sellers and buyers b2b buyers enter the site and signup and after that thay can send request for orders for example labtop to the sellers in labtop category by Email only 1- changing Header Design i will provide screen shot for example of design 2- add statestic system in admin . for example ( i set dates from 1-1-2018 to 30-1-2018 then i get how many orders - how many closed orders - how many buyer sign up - how many seller sign up - how many sellers got closed orders ( dealed with ) and who 3- Email Center ( i can send Email to all the sellers or buyers or both together for news or any update in the website 4- Sms center ( same as Email center for for SMS ) will provide sms company soon 5- invoice system ( i want to send invoice with my logo and name E bill to premium sellers via admin and keep a copy from the bill in my admin for my accounting ( one go to seller Email and copy stay in the system for futuer review 6-Change category signup list for Sellers from Select to Check box ( i might get seller with more than one categories . 7- SMS verification in signup API 8-closing order ( Send Email to notify the buyer to close his order after deadline is up every 24 hours until he close the order . this is will help u to keep tracking the orders 9- SSL for all the pages 10- uploading files for sellers ( add option in admin , if seller uploaded wrong file i can let him upload again ) now it's only one time upload 11- orgniaze uploading files for sellers profile , 1- goverment files CR 2- VAT 3- zakah x3 diffrents files and when i confirm them from admin in seller profile it's will get Right mark as Green (so its mean your files are good ) 12- categories hint in send request page for example when user select electronic category it's will show up or down the bar what is this category include ( mobile - laptop - printer ) example 13- password confirmation bar in signup for both seller and buyer 14- seller and buyer can't signup with same Email ( i can now ) 15- add username and password as backgrond test in login fileds 16-double check calender in send request page . because i tryed in with IOS laptop and it's not working 17-add new fild in send request page under quantity ( Unit of megerment ) with drop list (select option ) 18- add option to send x2 categories same as we discuss before . but fix it now . every category get the exact request 19- remove term and condition in send request page