I have 10 Years of Experience in Web Development using PHP, Mysql, Wordpress, Woocommerce, Bootstrap, HTML-5, CSS-3, Jquery and may more technologies.
Below are the points which i will take care in this task.
--> check database username and password . If not strong then i would recommend to make it strong.
--> Admin username and password. If not strong then i would recommend to make it strong.
--> Change default login url to something unique
--> Check server site files permissions
--> Check the code and remove unwanted script and code
--> if require then run PAN Test