You can start farming on land that you lease. When you have enough hardware and capital you start buying gradually. Starting as a farmer is very difficult but not for these reasons alone. Learning craft is super difficult. Sometimes you have one shot during a season to try something. My parent had higher education, where born into families with farming traditions but still took a decade to master vegetable production.

Amish cannot afford land because they suck at farming. They lack education and intentionally do not use modern farming techniques.