Congratulations! What wonderful news :)
Our family finding social worker sent a draft introductions to all parties and we got a chance to feedback to her then had a meeting where we all went through it step by step. It covered things like any nursery goodbye parties, what stuff was to be moved and when, any sleepovers and collection times etc. Then we got to push back on things that involved journey times or practical matters etc. At one point they wanted him bringing back over rush hour, which would have meant 2-3 hours in the car, and his FC didn't have one, so he really really wasn't used to it.
We asked to be allowed to observe him in nursery which was helpful because we could go to his new nursery and explain his baseline behaviour.
Make sure you factor in stuff for you as well, like last minute shopping, some r and r, time to chat with friends etc. Be pushy about it if you need to- expect it to be weirdly emotionally intense in a way that you didn't imagine... I cried on my way home because we left a paw patrol ball he played with at the park and I couldn't find the same one to replace it with. He didn't give a crap, it was me, but it was hard!
We found it helpful to take photos because you are now becoming part of your child's story that they are conscious of. It's nice to be able to tell them stories about where they spent at least part of their childhood, what parks they visited, what route they took to the local shops etc. It connects you with them and that place as it were.
Expect it to be a bit weird with the FC. You spend a lot of time in their house and (hopefully!) Getting to know them quite well, but the only thing you have in common is the child. It's an odd and intense experience, because you are also sort of taking a crash course in parenting whilst being hovered over by the FC who has their own way of doing stuff, and as a first time parent it can feel hard to balance what you think should be done vs what they know should be done.
Don't be afraid to ask for it to be shortened or lengthened depending on the vibe of the child. Some kids need time to warm up, some kids just need a clean break.
Plan, plan and plan. Honestly, it helped us to know that we could go home to a meal from the freezer, we had all the laundry up to date, snacks for us in the car, we put reminders in our phone to fill fuel tanks up and keep track of mileage (you can and should be reimbursed, make sure you do that!) And look up stuff like local parks both near you and the FC, indoor and outdoor. It's nice to have the option of popping into somewhere for a coffee to kill a few minutes or to buy a treat or know where tesco is to grab some of their favourite snack.
If you can, try to really talk to someone about their final day before it actually happens. Ask whether the social worker will be there, will it be a fanfare or just a "normal" goodbye? We had it both ways, and if I'm honest, the low key one was a bit harder as it didn't feel like there was much closure. He half expected to be taken back that evening, whereas with his brother it was definitely clear it was final because there were a few gifts and his social worker was there to escort us to the car and do the official handover and paperwork.
Good luck, and remember to take care of yourself. Its important to make sure you can pour from a full cup, not an empty one!