Glad you asked...
If you are going to be giving someone a blank check, simply fill out the check as usual, but do not write in any amount. Remember to sign the check!
Then again, this answer might help you...
Filling out a check is very easy! You will need to fill in the date, to who the check is being made out to, then you write out the amount( for $20.00 it would be Twenty dollars), Then all that is left is to sign your name.

