Various PHP, mySQL tasks needed for website

I need to hire someone to add the following things to my website. A friend has already done a few simple things to the site using PHP and mySQL but my programming knowledge is extremely limited and the tasks below are beyond our skill set. If everything works out then I will probably have work for you in the future as well. Let me know, thanks! 1. Ability for user to create their own account and profile, with ability to comment on blog or news posts and do searches on the site. 2. Set up a blog or news script which is fully integrated with my site design. I might not need this, I already use cutenews, but if you can recommend something easier I'm all for it. 3. Set up mysql database so that users can login and search their stats for different periods of time. At the moment, they can login and see their stats only up to the day of the current month but I have all stats saved from previous months. 4. Show me how to place information from the database into certain areas of my site, such as some kind of leaderboard or latest news articles. 5. Do I need some kind of backend system to manage this? If so, then I'll need that too! Regards, Bill