Now, open your �Floral survey device�, and look at the list. If your lucky, you should find some �Cereal� type resources in the list. If not, that means that there are none on that planet, and you will have to make something else. (Unlikely)
Pick the first on the list, and hit the survey button. You should see some colors and lights go out from you, and the map part of the window should display some percentages. This is how much of the resource is in that area. The higher it is, the easier it is to sample for it, and the faster harvesters (machines that gather resources for you) will work.
If the number is fairly low, below 50, survey for the other �cereal� types on the list, and pick the highest one. Now, normally, if you are wanting to get a lot of this resource, you would travel to the place with the highest percentage, and survey again, till you get the highest number you can. (Remember, use the radar to avoid combat, if you want). If you have a decent number now, though, just hit �sample.�