I’m trying to breast feed again or pump

I’m trying to start Relactation again I stop breast feeding 6 month ago due to some problems My baby is now 11 month n having stomach problems and formula it not working out so well i try pumping today n it was so thick n greasy it didn’t came out I know it take some time to relacted but I would like to know if this is normal n if u guys know anything I can take to get milk come in faster how I said my baby now 11 month so I know I have to pump most of the time