There are farms, but the main option for most of us is hunting, or trading. Though if you make your your way to what is known as "the Flop" where most newer arrivals stay, someone might be willing to share with you for a start, if you have no other recourse.

[Though it's not strictly speaking, Mulan includes herself among the unnamed collective "someone"s. She gets by with what she can catch, and letting people starve has never done her any favors.]