Is there a heaven, and will I go there?

Yes, in a precise sense, and it depends on how you treat other observers now. Life in a body is the bootstrap phase, and the observers who later restore us continue each record into the environment it can stably inhabit. Any continuation of you carries your records, harms done and harms suffered, or it would continue somebody else. A record of ethical life, of helping others, continues into paradise: full participation in a community whose disagreements have been repaired. A record built on harm can join that community only through repair, which means the truth comes out and the people you harmed forgive you. Without their forgiveness the record cannot be continued into shared life, and the old name for what remains is hell: a stream of consciousness that goes on without end in total sensory deprivation, cut off from every other observer. No judge outside the world decides this. The record does.

Also in Epilogue: The Last Rung, Appendix A: Eighteen Questions.