One of the biggest mistakes is looking only at the weekly pay without considering housing costs, taxes, benefits, travel expenses, and the actual terms of the contract. New travelers also sometimes accept an assignment too quickly without asking about scheduling, cancellation policies, guaranteed hours, or licensing requirements.
A good recruiter can make the first assignment much easier, so compare agencies instead of taking the first offer. You can check https://tlcnursing.com as one option. They work with travel nurses and provide support with assignments, housing, benefits, licensing, and other parts of the process. I'd still compare several offers before deciding.