When the baby begins to take solid foods at the age of 5 - 6 months, there is very little difference what he starts will or what order it is introduced. You should however, avoid spicy foods or highly allergenic foods at first, although if your baby reaches for the potato on your plate, you should let him have it if it isn’t too hot.
Offer your baby the foods that he seems to be interested in. Allow your baby to enjoy the food and don’t worry too much about how much he takes at first, as much of it may end up on the floor or in his hair anyhow.
The easiest way to get iron for your baby at 5 - 6 months of age is by giving him meat. Cereal for infants has iron, although it is poorly absorbed and may cause your baby to get constipated.