I would highly recommend reading the book of Revelation. It’s filled with details regarding Heaven and the ends times. God revealed these details to John while he was on the island of Patmos. Jesus told him to write certain things down but other things he wasn’t allowed to.
Our minds can’t even comprehend it all. We hear John 14:2 a lot at funerals which is very comforting-

New King James Version
In My Father’s house are many mansions; if it were not so, I would have told you. I go to prepare a place for you.