Add validation and fix small error!

I need someone to fix a small error in my admin panel, as if your not logged in it returns a MySql error on some restricted pages. Also i need Validation adding to the registration pages. Looking for the cheapest bid, as have already spend loads on this... Also if i like you work i would be looking at carrying out a whole new section adding a ecommerce and subscription system. Only message if your interest in this. Also would be good if you know Java too! as i would like some help. Many Thanks