So term 3 and 4 the year before prep, there are prep transition sessions. There were 8 over these 2 terms. They were short (45mins) sessions to help introduce the idea of the primary school environment and the teachers to the kids.
There were also concurrent parent information sessions to help parents transit too. Eg. The parents association, the uniforms requirements, the principal, the school grounds, etc.
Another aspect of my transition that helped is talking to the kinder mums who have an older sibling at the primary school already. I asked them about uniforms, what the teachers are like, if their child coped well, etc. All were really helpful with the information.