@Paulus as one Paul to another and with a little granddading experience. A little advice. Be prepared for nesting behaviour in your house. Stuff you didn't know you needed, perhaps have never seen before will appear, a drawer or drawers will be designated for the baby, be ready with the correct response to the "I saw this and thought it was lovely/cute/cosy."
On a serious point Facebook market place is an invaluable source of quality secondhand baby stuff and good prices. If you have a local community FB page/group this can be a great source. We've had three top quality, Which? recommended, car seats for less than £100 - all from people we know. These were £300+ each at today's prices. Car seats with a spinning base are essential for us more mature folk.
For me the number one thing. Choose your own name. I was always going to be Granddad, none of the other choices were on my list. Though I still feel a touch of sadness that the oldest has stopped calling me GanDan. 🤣