Adopting, as a family with a birth child

hello, my husband and I are considering adopting a new child into our lives, to join us and our 2.5 year-olds as part of our family. we naturally have a lot of questions around how it works as parents, siblings and a family with both birth and adopted children. does anyone have had this experience and can shed some light for us on what kind of things we should be expecting/preparing for? thank you, G