how long do i heat up my malted corn and what tempature do i bring it to before i add the yeast?

Answer 1

If you're converting the starches in the malted corn, keep it below 155 for about an hour or until the iodine test is negative.
Then let it cool to room temperature before adding yeast.

Answer 2

malted corn?

If your making beer you usually use malted barley either make your own or use an extract. You boil it with hops, then you need to cool it down to room temperature before you add the yeast.