Help!!!

First of all dont judge me... Im breastfeeding my LO hes 4months old and i wanna start him on formula because of personal reasons i been trying to give him the bottle but he wont take it he tries but doesnt know how to suck it any tips on how to introduce the bottle... He doesnt take a pacifier either we havent gave him at all please help he will be breasfed most of the time but here and there i need to give him formula and no i dont pump please help ftm