It varies significantly by country. Some destinations offer visa-free entry or visa-on-arrival for many nationalities, while others require an e-visa or advance application. Check each country you’re visiting individually.

Each country uses its own currency, so plan to withdraw or exchange money after arrival in each destination. Cards are common in cities, but cash is often needed in rural areas and local markets.

Yes, generally — Southeast Asia tends to be very budget-friendly, while Japan and Singapore run notably higher, so plan accordingly if combining destinations.

November–March avoids monsoon season in most of Southeast Asia; spring and autumn suit Japan and China best.