Please help with introducing baby to solids. More questions inside?

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When did you first introduce your baby to solids? How much solids to feed? How often should you first feed your baby solids? What did you give your baby first? Cereal, fruits, vegetables?

I started giving my baby solids yesterday. I started off with bananas but I was told by my mother-in-law that I shouldn't start off with fruits. He kept spitting until my mother-in-law fed him sweet potatoes and I noticed less spitting and funny faces he made when I fed him bananas. Then she gave him his bottle. His next feeding which was a little over 3 hours later she told me to put a spoonful of cereal in his milk and I did what she said. My baby is a week away from being 5 months. He currently weighs 16 pounds. And yes I am a first time mom. Thanks for the response!