MySql Database rework

Looking for help on a database website. Most of the website has been configured. There are only small changes that may take time since different parts are related to each other. 1) Need to change the order of the results so they show the most recent first. 2) Change the results to pull out records that have the same three fields. 3) Change the search bar so that it will search the results of the previous search - not just the whole database again. 4) Back Control so that after submitting an item pressing back in the browser returns to a blank screen with their input erased. 5) Security box displaying numbers and text that must be typed in for the record to be submitted. These five things are not too complicated. The main problem would be translating your work into the existing website to make sure it functions properly.