Good luck Jags
I started riding a tandem with the wife about 2 years ago after solo riding for 30 years so it was quite a shock.
First issue was trying to find a comfortable cadence that both of us were happy with. I prefer top side of 100 and the wife prefers bottom side of 80 so this was not that easy to achieve.
The second thing is communication. Every gear change, every start of pedaling, every length of coast needs announcing. Sort of like "and coast in 3 , 2 ,1"
Starting off and getting going is the most difficult bit and needs practicing on a quite, flat road. Once you are up to speed it gets pretty stable and all should be good.
We found over time that less and less communication was needed and more chance to enjoy a chat about other things than just keeping the bike moving.
Have fun
Andy