Pumping and milk supply

Deejay • Married to the love of my life. We have 2 amazing kids together.
Hi ladies ,
I'm a new mom and having a lot of trouble with milk supply. I have heard there are lactation cookies does anyone know if these work or where to buy them? 
Also wondering if anyone had tried a hands free pump and are they worth the investment? Also what's a good brand? 
Thanks a ton ladies.