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To have the building designed incorporating renewables and to limit energy use you need to appoint a suitably qualified engineering consultant. In the UK there are many, such as Arup, Buro Happold, Useful Simple Projects; you can just search for them online. However, you will need a substantial budget for them to work on a project like this in a meaningful way. You would likely be better off looking for a suitable consultancy in India, where it would be cheaper. EWB-UK's partner organisation CSE India might be able to point you in the right direction: https://www.cseindia.org/taxonomy/term/20573/menu.

I would be wary of doing this badly. It is far more important that the building is affordable, culturally appropriate and maintainable, so it is well used. Building an environmentally friendly building which decays and is not used is far more wasteful and environmentally damaging than one which is more basic but used. Remember the social and financial aspects of sustainability as well as the environmental ones, and remember the core aims of your project and don't be too distracted by trying to do everything if you don't have the resources or expertise in your organisation.