Simple answer. If you need to ask how to secure something, get someone else to secure it.
Security is the most important thing with regards to websites. If you want to be able to handle security yourself, you must be able to understand the logic of the attacks which may be performed on your website. You will need to understand the risks and take measures accordingly.
The above isn't an insult. It is meant to inform. Everyone has to start somewhere, and everyone learns and can become an expert. The amount of people who I see starting out in your exact position, getting someone post something like my message and 4 years down the road seeing them again being knowledgeable within their field is incredible. Most of my fellow programmers had this experience, and I did as well.
I'd focus on getting a website complete first. Make your website, program it, and then deal with security before release. You will start to realize (based off logic) what security exploits may be available and when you look up other security exploits, they may make more sense.
Good luck
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