I will try to make some kind of cool looking form for trip planning but the list of things to address include:

Flight Costs:

Food Costs: 

Lodging Costs:
Transportation Costs (bus, van, taxi, etc):

Immunizations Needed?:

Homestay Possibilities:

Service Possibilities:

Itinerary/Possible Activities:

The traditional basics of the trip to account for include:

* 14-16 days total

* Travel in late April-May usually

* Group size will likely be about 15-18 

One place I start for very basic travel information on a country is Lonely Planet. This has highlights for travelers, basic cost information, etc. Feel free to post questions, ideas, and insights as you do your research.