HSA and tax filing

Hi

I am planning to enroll myself and family in HSA-HDHP plan. My employer also contributes some amount to HSA plan. I want to know if we reach the HDHP out of pocket maximum and we pay that money through HSA, do we need to declare anything while filing taxes. Do we need to preserve the receipts of the payments we made. Does my HSA bank give me any document giving details about the money I take out from HSA account.