Let me ask you this: have you engineered the program? Have you gamed it? Drawn action cases...such as: say I want to register...what actions must I take? Have you accurately defined it each functionality and exactly what you want it to do, what steps are needed for each course of action. How one portion interacts with another?

The worst thing is to have a foggy idea, with out step by step pencil and paper action board designing and just have a programmer start programming. Most of your work should be done before the programmer starts to program. Otherwise you get worthless or even worse then worthless spaghetti code.