Don't say things like this. Or if you really must, limit it to here. People from here won't try to hurt you in reality but you may strike a nerve of some nasty character. I don't want you to get yourself in trouble.
Let's wait with this until I actually deliver

Some question would be nice - it can be very general in nature. Celtic Cross is usually an answer to a question. We can also do something else (Choice, Advice, general three cards reading, yes \ no \ unclear).
Also, about the markers. We're of course doing it as a party trick but I try to do it properly

Generally when you do a reading for someone else, especially when they are not in the room with you and can't touch the cards, it's good to pick a card to represent the person you are doing the reading for and have it on the table. You are not limited to Minor Arcana figures but I think they provide enough archetypes to pick something for any person