1) Is there any documented procedure or checklist to verify if there are no artifacts from prior trials?

2) Could I start ORDERER without any information about channel and genesis block in orderer.yaml, and create after using "peer channel" command?

For example, adding # before parameters to remove tem?
#- ORDERER_GENERAL_GENESISFILE=/etc/hyperledger/fabric/configtx/genesis.block
#- ORDERER_GENERAL_GENESISPROFILE=OrgOrdererGenesis