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As for the error, bitcoin core needs to gather transactions to predict a suitable fee to use. Your node probably doesn't have enough transactions gathered yet, which means peers aren't sending you many transactions. Best thing you can do is wait for a few dozen blocks or so to get confirmed and by then, your node should have enough information to estimate the fee that's appropriate for the next block.

In the meantime, if you really have to send a transaction right away, you can use Jochen Hoenicke's mempool statistics, second graph, to see how much other transactions are paying, and pick a fee within the range that the most transactions are using. But I would wait until your node finishes syncing.