Sorry to hear about your mum. I lost my mum 10 years ago, and since then I have seen in her in my dreams. Dreams are excursions into the astral, so take note of your dreams, and be patient.
Yes, do go into in the light. for a lot of people, it is just natural, you enter a tunnel and at a great speed, you go to the light.
There is no death - it is just a transition, and things are remarkably similar to here on Earth.