i have started with doing tricks/illusion 5 days ago

and i have tricked a couple of people with the levitation illusion and the arm twisting thingy. and i have done some card tricks on my friends. but i am having some problems doing a DL that people think is real. every time i do it thay say but you have two cards there. but they dont see two cards they just say thar\t i pick up the card verry strange

so do you guys have any tips/moves on how to make a DL look real?
and what learning movie of cards do you think is the best? the things i want to learn most is cool moves, tricks and the thing i want to learn most is the torn and restored card trick (does that trick need some spesial cards?)