YuGiOh deck and side deck help?

I'm running the demise OTK at the moment and one of my biggest fears is if my opponent side decks against me especially with cards like Mind Crush. My main deck doesn have much spell trap defense, only Giant Trunade. I'm working to get a few Trap Stuns to protect demise when he is played. I don't have a side deck made yet and I'm looking for what I should put in it. Please give me any ideas on what to add to protect my hand and to give Demise safe ground to be summoned on.