No you don't need to cook the chickpeas first, they're ready to use. I know we are lucky with Charlotte i just hope it lasts. Jack is terrible with food and like you i cooked all of his baby foods and under one years of age he would eat it all. Now getting him to try new things is impossible so it's nice to have a 'dust bin'! We call her that sometimes as she'll eat near enough anything, even a hot homemade curry that wasn't meant for the kids. If Katelin doesn't like sausages, the cheesy baked beans goes well with potato, mashed or jacket.
Zoe x