Welcome daisynut. Congratulations. Do you want advice specifically about introductions?
Do you yet have a plan of how they will take place?
My advice is:
Get lost of rest and sleep before they start, tie up any loose ends with work etc in good time, so you can go into this process refreshed and ready.
Ask the foster carers what you can bring if you will be sharing meals. This might just be lunchtime stuff, drinks, fruit etc - whatever, it will be a nice thing to do and can make an ice breaker to arrive with some nice cakes or something (IMHO).
During the process of meeting your new child try and be calm, take it as it comes, relax, the foster carer may be experienced or new to it all, they may be nervous. Ours was fabulous made me lovely cups of tea, talked to us loads and we really connected, which has made staying in touch much better and easier.
We tried to call ourselves Mummy and Daddy to our son from the start, he was 3 so a lot older but still better to start as you mean to go on.
We took gifts for our son, a teddy, and on the first day we gave it to him and said "Can you look after teddy for us and we will see you tomorrow." Again your son is quite young but you could do this.
On the last day we took flowers and a card for the foster carer.
Good luck. And Congratulations