Fix a web page and changes to the site

I am currently developing a site and I should update the selection queries and show the results on the video. A search is already structured within the site. You just have to readjust it to the new database and existing searches (making sure the searches work) and then create a detailed page of what you've selected.
The site was developed entirely by writing the code in php without the aid of wordpress or plug-in.
I will take into consideration only the offers with a deposit of 25 euros and this will give me a constant situation of project development.