I take them in the field with my dogs daily and we walk every corner of the field so they can get to know the area and know where they can't go.'but they don't like it'
All incubated emus are, ummm, sorta 'orphans' in that they lack Dad to instruct them. (We have extensive observations of this instruction here.)
Now, 9 acres is a splendid world for them. So, if you have the energy -- 'cause they're bonded to you -- put some treats in your pocket, and take them exploring. On one occasion, while they were still chicks, I took Greedy, Number One, and Felicity all the way to the river, which is more than two miles. The next time, I took them the same distance in the other direction. They'd follow me -- with a little bit of treats -- like puppies.
So, the 'snatch-twist-pull' of chicks' food-gathering is great exercise for them, and you'll get a chance for some great observations of what foods in the paddock they like.