To join specific programs at IVHQ you might need certain things (e.g. if you are going to do medical stuff, you're probably going to need training for that), but for the Nakavango program I went on, you don't need much more than you would for regular travel such as a passport, your flights and tell them your itinerary. They also required you get a business visa for Zimbabwe (check the gov website...
Volunteers must be 18 years or older to participate on an IVHQ program alone. However, if they are volunteering as part of a group with adult minders, or with a parent, guardian or family member who is 18 years or over, they are eligible to participate. When a volunteer under the age of 18 applies to volunteer with IVHQ, it is important that the name of their minder is noted on their application...
To join specific programs at IVHQ you might need certain things (e.g. if you are going to do medical stuff, you're probably going to need training for that), but for the Nakavango program I went on, you don't need much more than you would for regular travel such as a passport, your flights and tell them your itinerary. They also required you get a business visa for Zimbabwe (check the gov website...