starting rice cereal

So my son's pediatrician recommended that we start him on rice cereal in a bowl using a spoon. Tonight was this first time I tried it with 4oz breast milk and 3tbs of Beach Nut cereal (those were instructions from the doctor) and it was super watery. My son wanted nothing to do with it and I expected that with it being his first time. Is the cereal supposed to be watery and suggestions how to help my little become more comfortable with trying the cereal?