there are 2 basic styles of wheat available, spring and winter, and within them are two basic varieties, red and white. each can be be found malted and unmalted and flaked for the most common. the key is to find out how the wheat berries have been processed and proceed accordingly. typically if the wheat hasn't been modified in any way, it will be described as "raw", which you would want to do something like pompeii states to be able to get sugars out of it. there's all kinds of interesting articles out in the great www to research differences, profiles and techniques to proceed with each style.