Is realizing anatta, will it help meditation? If i realise anatta will it help me calm and focus my mind in meditation? If so how?
Eliminating self-view (first realisation of Anatta) is the pre-requisite becoming a Sotapanna.
There is two type of meditation. (Samatha and Vipassana)
Realisation of Anatta is not required for Samatha meditation.
However, in Vipassana we contemplate on the Anatta.

My personal opinion is that realisation of Anatta will help both meditations.