Re-establishing milk supply

Baby was born 9/27 and I started off breastfeeding. Did for the first couple days but baby wasn't latching on, decided to just formula feed. Now that he is almost a month old I want to try again. Have been having baby on my breast for the last 2 days and he is actually latching on. Question is how do I re-establish my supply? I have been drinking mothers milk tea and taking a breastfeeding supplement for about a week with the intention of trying again. Any other suggestions on how I can start producing more.