Have an understanding of what type of farming you want to do? There are different options in this like NPK Farming, Organic Farming, Natural Farming etc. Once you get an idea on this, deep dive further on the specifics.
You can visit "Vanagam" run by Dr. Nammalwar for getting to know the details by doing hands-on work on Organic Farming.
You can checkout my blog and other blogs to get an idea and pick ideas from them.