I'm a newbie, and for a while I was picking a card in the morning, but then I'd either spend all day waiting for the "event" of the card to happen or I'd forget about the card, and many times I became confused about the meaning.
So in order to start learning the cards better and connecting them to myself, I started picking a card at night and asking myself "What happened to me today?" or "What lessons did I learn today?"
Since I've been doing that, it's been easier to look back on the day and better understand the card's meaning and what it could mean in future readings.