know how to start doing that? How do i go about introducing that to her and how much? Should i mix it with cereal? What do i do?

You should start for asking the pediatrician. He/she could give you guidelines.

yes, get some jars of baby food peaches and mix it with the cereal...then just offer the peaches...

of course, start with only pureed foods...and taste the stuff! if it tastes good to you, she will most likely enjoy it too.