Web programmer for web sites (scripts)

Hello , I have a script and a bot to it . The site itself is roulette things from the game counter strike . In the script there is a file formats , like js , css , php . In General I want to test the script with the bot , remove all bugs , holes in the script of the site and the bot , so that they could not hack the website or the bot to do a backspin the winner of the site admin , to rewrite the system of random selection of the winner (to win the people with more % of winning in most cases). I hope I have clearly explained what needs to be done . If you are a good expert in programming languages and will be able to perform at its best please unsubscribe in the subject.