How to start sip

I want that on every first working day of month I buy niftybees worth 5000 rs without manual intervention. How can I do it?

This is currently not possible without manual intervention. For this, there has to be a smart layer over Kite that can buy Niftybees in a SIP set by you which is currently unavailable.
For now, you will have to manually login to Kite and buy Niftybees on the first working day of every month.

Yes it is possible with some brokerage firms like icici direct , Hdfc securities, kotak .
They call as ESIIP (icici direct) where you select date , qty based as well as amount based for fixed period like 12 months 24 and so on.In Hdfc Securitiea they call as DYSIP (do it your self SIP ).
So please check with ILFS securities with whom Zerodha has a tie up for its clients.Most likely they should have this facility.
I myself done esip in my Icicidirect demat account.