Hello guys, I want to start adding raw meat to my diet.

My understanding is that I should eat grass-fed cattle only, which I found a farmer's  market near me from http://www.eatwild.com/products/californiaresources.htm :

Irvine Farmers Market
Saturdays, 8am-noon
Campus Drive and Bridge Road
Irvine, CA
Diamond Mountain Ranch
http://www.eatwild.com/products/california.html#diamond

Also, am I supposed to eat particular chicken/eggs? I was watching a youtube video of someone saying he only eats chicken that are fed non GMO corn. Is that found at a usual farmer's market? Does this go for eggs as well?

Are there any specific types of grass-fed cattle meat I should get?

And finally, have any of you gotten sick from these diets? How will I know if I'm sick?

Thank you!