Hello, I am so glad you found this forum!
I can not say that I am an expert or that I can give you the text book answers, but I will try to help out.
1. When Jesus was being baptized God showed himself in three ways. On the cross Jesus (the man) spoke to his Father (his divinity). When Jesus returned to Heaven him and his Father both sat down in his Father's throne.
Rev. 3:21 There is one throne in Heaven.
Rev. 4:2. When you get to Heaven you will only see one God sitting in one throne.
2. So what about the phrase on the right hand of God?
LU 22:69 the Son of Man sitting on the RIGHT HAND of the power of God.`
AC 2:33 at the RIGHT HAND then of God having been exalted
Jesus is sitting down in the one throne in Heaven in power and authority because he has been exalted.
Sitting at the right hand is a first century Jewish saying. If I told somebody it was raining cats and dogs they would not understand what I meant if they were not from my time and culture. Sitting at someone's right hand simply means that you have their power and authority.
Hope this helps.
If I got anything wrong as far as saying it backwards, anybody else can chime in and say it in a more clear way.