Hi, you don't have to send a fair trade if you want to gift someone, but you'll have to put at least one creature on both sides. You can't let one side empty on GW
also, know that asking for a gift is very poorly viewed here, so asking for a bunch of creatures and giving almost nothing in exchange will result (most likely) in a refusal of you trade
edit : i just saw you're very new on the game so welcome to you