Following your groundwork and selection on who will carry out the Obeya Builders and Obeya Host roles, you should consider which team of people you want to start your Obeya with.
Ideally, the team consists of people both willing and able to contribute to the development of your Obeya and at the same time benefitting from the results straightaway. The team shouldn’t be too large as you want to be able to move forward with some speed. There should be enough common ground between the individuals (and parts of the organization they represent) to be able to discuss and decide on actual and relevant matters.
Be sure to involve some individuals that have access to (and understand) relevant data sources. Choose people that are able to commit some time and effort into the process and try to refrain from switching or delegating this effort as much as you can.
An example of an Obeya core team composition could be: 1 senior sponsor, 3 key users, 1 Obeya Builder, 1 Obeya Host, 2 data specialists.