Need community help with opinion and guidance for farming in puttur karnataka

Dear Friends,

I was in marketing line so far and now planing to opt for farming as my lifestyle.

My reason for this change is want to come out of stressfull life and want peace filled livelihood.

I have 3 acre of land at interior part of puttur (costal karnataka) which has areca and coconut. Because of water problem and may be unfartail soil, yield is very less. I want to try new crops here.

I have no idea about fertilizer, soil treatment and other harvesting technique.

I want help from you friends about the choice of vegetable and fruits i can consider for trial.

If you can guide me to any book that will give idea about soil fertility and means to increase it, that would be of  great help.

Thanking you
Ajith