Intro to baby food suggestions???

How do you go about introducing baby foods??

I have a friend that gives her baby a half of the plum organics baby food and has him drinking a 4oz bottle after. When she doesn't feed him baby food it's just regular 6-8 oz bottle.

I have another friend that replaces bottles 3 times a day with a whole container of food at each sitting.

What I've tried, is in between bottles just a few bites of a food for 3 days in the morning and afternoon then on to another food to try for 3 days.

Am I doing this right??? I know there really isn't any right way, just any suggestions would be helpful