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My name is XXXXX XXXXX I am a General Specialist, but also an adoptive parent in the US. and can give you some information. We had to go through the same protocol to be come an adoptive Parent as the Foster Parent.
The First Step is to find an organization that manages Foster Children. Many Churches, as well as the Government have Foster children available. You will need to register with the organization. https://www.gov.uk/foster-carers/becoming-a-foster-carer
The second step would be to get clearances done like Finger prints and background checks which have to be done. The organization will set up a Home study, which they will ask all types of questions and family history. They will interview all family members including any children at home. You will be asked to decide on what type of child you can handle. https://www.gov.uk/foster-carers/training-and-support-for-foster-carers
The last step, is a training class before a child, is matched and placed with you. This is the types of Foster Care: https://www.gov.uk/foster-carers/types-of-foster-care