Vb scrub, first of all - welcome to the Forum. Hopefully you will receive tips and techniques that will help your officiating to improve.
In the NFHS Case Book, the umpire is instructed to show the card that they are requesting to their partner by displaying it in the middle of their chest in the hand on the side that is being sanctioned (Yellow Card for warning; Red Card for penalty). We want to be sure that we are using proper protocols and that we have discussed them with our partner before the match so we know what we are going to do if the situation arises.