You can start small scale production whenever you want. But for commercial production, it will be better if you can complete a short or full training.
Learning from existing farmers is also a very good option. Actually practical experience is much more important than book knowledge.
Today, there are many government or private NGO available throughout the world who are providing training facilities and other supports for starting and operating this business.
I would be interested to train more in animals rearing
goats or cows