Hey Nelly
It differs from mom to mom, but I suggest you try solids on the morning feed - around 10 - 11am as you indicated.
For the first meal, you would aim for a total of a teaspoon to a tablespoon of very watered/milked down rice cereal. Only slightly less runny than milk.
Most of it is probably going to come right back up again, and that is fine. You are not feeding to make him full, more that he adjusts to the sensation.
Once he is done, I would wait 5 - 15 minutes and then give him a bottle, so his mouth has a chance to feel the variance in sensations, rather than go straight to a milk bottle.
You may need to repeat this for about a week, before you will be able to drop the 10am milk feed and give cereal.
If you are introducing solids, then remember that you should start introducing water to prevent constipation.
I opted to feed solids, and then introduce a water bottle straight after, as usually the porridge makes baby thirsty and they are looking for a thirst quencher.
Once the 10am is established, then you look to adjust the 5 - 6pm to change that to cereal as well.
However other moms may suggest other approaches.