Dáme si předkrm nejdřív ?
Do you have a question about this sentence? If yes, please do ask the question. Otherwise it will be just removed.
Let´s have an appetizer first? Is it also correct?
No, because that's not a question, it's a suggestion. That would be "Dejme si nejdřív předkrm" or "Pojďme si dát..."
OK. Thank you.