To ensure that the blocks are synced up with your node, under "sync_info", "catching_up value" should be false "catching_up value": false. This may take a few hours and your node has to be fully synced up before proceeding to the next step. You may cross reference the latest block you are synced to "sync_info": "latest_block_height" and the latest block height of our Testnet blockchain on our Testnet blockchain explorer or our Mainnet.
Make sure that every node has a unique priv_validator.json. Do not copy the priv_validator.json from an old node to multiple new nodes. Running two nodes with the same priv_validator.json will cause you to double sign.