What is green field venture?
A green field venture refers to a project, transition or change where you do not have to take existing facilities into account, but are allowed to make a new designs based on the requirements set up.
This as opposed to a brown field, where your design or plan has to take a lot of existing facilities into account.
For instance, imagine a project where employees of a company are going to move into a new building. If they bring their old PCs, and the company brings all of the old furniture, and IT moves the same old WAN and LAN cables in, it's a brown field.
If they get new PCs, furniture and everything, essentially leaving all the old things behind, it's a green field.
Doing MBA after BTECH is not a bad choice, since management course is about developing enterprenuerial skills therefore one can start up his own venture in the field of technology. But before going into your own venture there is necessity of having good amount of practical knowledge in technical field.