Pumping advice

Mimi ā€¢ Due 2019.08 with baby #2 Baby Girl šŸ’• 18/10/26

Hi all. FTM to a 3 weeks old baby girl. Just got a single electric pump. Baby eats usually ever 2.5h sometimes 1.5h sometimes 4h.

My question is: when is it best to pump to store and create a small frozen milk supply without "taking food from baby"?

Do you have a pumping/feeding schedule? Any advice regarding pumping and storing is welcome!