Well congrats on your new bird John but yes there are toxic substances that can and will kill your bird, you will find lists of them in our forum, just do a search to find them. Just like you have to make your house kid safe for babies, you make it bird safe for greys, not much different.
You expose your bird to other people, take him out with you to places he is allowed for the more people he sees the more chances he will be more accepting of new people so he does not become a one person bird.
I know you will find lots of different information on the internet but you will find the correct info here on this site and we do have many stories told here about their greys, now you need to do a lot of reading.