Yes. Even if you're shipping a "welcome kit," home addresses are personal data. Treat them accordingly.
Address changes can be possible depending on timing, but last-minute changes may create delays or additional costs. Finalize ship-to lists as early as possible.
Website content is often protected by intellectual property terms. Review the site's Terms if you're planning to reuse or reproduce content.
Use a standardized CSV, validate addresses, and keep a single "source of truth" file.