1. Passport: Your passport should be valid for at least six months beyond your intended stay in Zambia and have at least two blank pages for visa stamps.
2. Visa Application Form: Complete the visa application form accurately and legibly.
3. Passport-sized Photos: Provide two recent passport-sized photographs that meet the specific requirements set by the Zambian embassy or consulate. The photos should be taken against a white background, with your face clearly visible.
4. Travel Itinerary: Provide a detailed travel itinerary that outlines your planned activities and destinations in Zambia.
5. Proof of Accommodation: Submit documents that prove your accommodation arrangements in Zambia, such as hotel reservations or a letter of invitation from a host. This is to demonstrate where you will be staying during your visit.
6. Proof of Financial Means: Provide evidence of sufficient financial means to cover your expenses during your stay in Zambia. This can include bank statements or other financial documents.
7. Yellow Fever Vaccination Certificate: Some travelers may be required to provide a valid yellow fever vaccination certificate. Check with the Zambian embassy or consulate to determine if this requirement applies to you.
8. Return Flight Ticket: Provide a copy of your round-trip flight itinerary or a confirmed reservation showing your departure from Zambia.
9. Supporting Documents: Depending on your specific circumstances, you may be required to provide additional supporting documents, such as a letter of employment, travel insurance, or a letter of introduction.

In general, tourist visas for Zambia may have a validity ranging from 30 days to 90 days. Some visas might allow for a single entry, while others may allow multiple entries within the visa’s validity period. Again, these details can change, so it’s important to verify the current requirements.

As for processing times, they can vary from a few days to several weeks, depending on the embassy or consulate where you submit your application and the volume of visa applications they receive. It is advisable to apply for a tourist visa well in advance of your planned travel dates to allow for any potential delays.