you need to take medication to start milk production, I tried it about 3 years back. I actually managed express milk using a breast pump (about half the amount a cis-woman would express). It take time for the amount to build up, i remember the first time I tried, i only got a few drops.
It helped mature my breasts. I used a double electric breast pump, so i could do both breasts at once and extraction with a pump can make your breasts tender.
I extracted for about 6 months, twice a day. Then I took a pill to dry up the milk.