Any NGO doing this? Anyone else doing similar thing?
I have summaries of several large-scale tree-planting programs here: http://hubpages.com/hub/Trees-For-the-Wo… (Scroll down a little - the first section talks about why tree planting is important, and I assume you already know.)
Otherwise, check out the resources here: http://www.unep.org/billiontreecampaign/
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Logging companies replant trees by the thousands all the time. How big are the trees you want to plant? Little short seedlings or bigger trees several feet tall?
If this is a charity project you might want to ask for help from the local Boy Scouts and Girl Scouts in your area or from some of the Veterans groups, they do this sort of stuff all the time! There might be contractors or landscapers who will volunteer their time for this project - if it is a charity or for the public good.
If it is for your own personal use then hire a landscaper.
Loggers do this type of planting all the time, that is why