P.R.
After 2 weeks it is all right to introduce the next food. I am so proud of you for going to vegetables next. Do not start with the sweet vegetables, however, start with green beans, spinach, or beets. They will love the sweet veggies and not want the other ones and you will have more problems with the veggies later if you start with sweet potatoes, carrots or peas.
After a month on rice cereal (or at the end of the box) I would go to oatmeal with veggies that are all ready established.
Good luck!