Respite care

Hello..family and I are new to the foster care process. We start our classes next week. At this time we are only interested in providing short term respite care between the ages of 0-12 years old. We already have one twin bed and one folding bed. Besides that we have nothing else. Should I start buying cribs, toddler bed and car seats..or should I wait. Do long term foster parents supply car seats, diapers and formula or do I need to buy these items? We are kind of thinking of going with instead of 3-12 instead. Been long time since we have had a baby in the house..not sure we are ready for a baby..as much as I like it. Thanks for the any advice you can give.