Fairly Easy Money
First, buy a Chicken and wait for it to lay an egg. Then put that egg in the incubator and wait for it to hatch while shipping the eggs you get from the chicken. When that chicken hatches then put another egg into the incubator. As soon as the second chicken grows up then sell it. This takes a ling time but is worth it after a while.
P.S. Always keep the first chicken and try to make it happy because then you will get better eggs to sell and make more money off of. Also I usually keep two permanent chickens but you can have more or less as you choose.
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