There are no rules as such. You can wear it or not. It is said that its vibrations are positive so it is good to wear it. If you have strong faith in it, you can definitely wear it.
See, I always say that your spirit is much more powerful than the Rudraksh. So have faith in that.
Your Sankalpa (intense or sincere desire) has much more power than any mantra or medicine or remedy. Everything has its own place and benefits.
The benefits of Rudraksh have been spoken about since many ages. But do not think that only by wearing it will you be able to achieve what you want.
Even if you relax and chant Om Namaha Shivaya, then that also helps. Your consciousness is far more stronger than this.