i have a question... im a first time mom... when you started your little ones on baby food how many…

i have a question... im a first time mom... when you started your little ones on baby food how many times a day and how much do you give them?

my son has been eating oatmeal twice a day and we are ready to introduce baby food. and i will be making it homemade. i just dont know how much and how often. thanks in advance!