Will we have jobs? Will we have bodies, or just be spirits? Will we all live on a giant-sized planet that is big enough to accommodate us all, or somewhere else? Will it be in a far-off place in this universe, or will we live in another world?
I've wondered about the same two things you mention: bodies and earth.
I believe in the statement: to be absent from the body is to be present with the Lord. So if you go to Heaven without a body and get a body later in time (at the resurrection), it makes you think that God must have a purpose for giving us new bodies.
And then you hear of the new earth in the book of Revelation:
Revelation 21:1-3 (King James Version)
1And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.
2And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband.
3And I heard a great voice out of heaven saying, Behold, the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God.
So when you put the two together: new body and new earth, it begs the question that one has something to do with the other.
And when you try to imagine the number of souls that are saved to this day and will be present at the resurretion to receive their new bodies, one might next try to imagine if we could all fit on the same size earth. But Revelation does tell us that there is no sea on the new earth.