If the manager decides you are a match to the job (or the most suitable match if other redeployees have applied) they will offer you the job.
If you accept the job you will need to agree a start date with your current manager and your new manager. You will then be sent your new contract letter.
You will probably have a three month trial period in your new job. During this time objectives will be set and you will have regular meetings to discuss your progress, training requirements, development and how your are settling into the new job and department.