My parents always rescued from dogs trust but they were saving lurchers.
Everytime there was a questionnaire to fill in this was just general questions about hours the dog would be alone where the dog would be kept and what you would do in certain situations (ie having a baby) they then have a meeting with you and ask the same sort of questions and tell you all the information about the dog you also get a chance to ask any other questions. Normally there is a small fee/donation to reserve the dog. They require every member of the family to meet the dog to make sure they get on. If there is a dog already in the family you can usually arrange to have a few meets to make sure. Then there is the home check this is usually to make sure the garden is secure and the fence is big enough. They may also ask more questions like where is the dog going to sleep and eat. After that you normally can arrange to make the final payment/donation and collect your new family member.
Dogs trust gave a collar, lead, dog bowls for food and water and about 1 weeks worth of food they are on so you can switch them slowly. But when we rescued Mollie from Cheltenham animal sanctuary none of that was included and they couldn't even tell us what food she was being given or how much or how often. So the advice and help you get all depends on the people from that particular rescue. hope all goes well for you in your search