So all the armchair farmers are out en masse. "Isaan" is a huge area, apart from that, even in our village, there are differences between one area and the next. This side of the road we can't grow sugarcane or members of the nightshade family (tomatoes, chili, etc), 10 minutes walk away you can. So no advice from me apart from the post above advising the poster to look around at what is actually growing locally. I too was going to revolutionise farming when I arrived here and now realise why it is barely a subsistence occupation for most.
The only thing I managed to get done was with the cattle, making sure they were properly fed and immunised. (costs money!) Even then, foot and mouth, various other problems made it not very profitable. So Livestock? Not for us anyway, even though we do still have 6 cows + a magnificent bull.