Why should I go to heaven and what will we do there and what after?

Thank you for the question. The questions about afterlife are always fascinating and everything about it cannot be known, apart from what the Bible teaches us about it. But to the question why should I go to heaven, I'll simply ask why wouldn't anyone want to go to heaven or Why would someone want to go to hell, as it is the only other alternative to heaven in eternity. Heaven is where there will ultimate joy and peace for a person who loves the Lord. Rejecting that and choosing the other alternative - hell is a foolish desire to have. Do read the recommended resource by Dr. David Jeremiah where he answers some questions about heaven. God bless!