Wearing Rudraksha first time
Rudraksha should be worn on a Monday or any other auspicious day after performing an abhishek at a Lord Shiva Temple. Place the mala at the base of the Shiva ling and offer raw milk and water on the Shiva ling as well as the mala while chanting "Om Namah Shivay" minimum 108 times. To enhance the effect further, the seed mantra of different mukhis in the combination should also be chanted at least nine times.
There is also a detailed Poojan Vidhi as mentioned in our ancient scriptures and the same can be performed.

Care & Precautions:
Rudraksha can be worn by all (Man, Women & Children) on a regular basis. There is no taboo while wearing Rudraksha. The mala should be taken off during sex, bowel movements, going to funeral grounds and menstrual cycle. The mala can also be taken off while taking bath as regular soap and water can dehydrate the beads. It is hence recommended to take off the mala at night and wear it in the morning after a bath, while chanting "Om Namah Shivay" mantra.

Maintaining the Rudraksha:
Rudraksha are very strong beads and have a life span of hundreds of years if maintained properly. The beads should be kept clean and free from deposits of sweat and talc, by washing them with plain water at regular intervals and cleaning them with soft brush. If the beads appear to be dry then you can apply coconut, olive or mustard oil to protect the beads from dehydration.