Normally you can take two cards to your hand when you choose to use a turn this way. If you see cards in the line-up that you like you can take them from there. If you want to take a chance, you can also draw from the Draw deck.

See that Multi-colored wild card second from the bottom? Those come in real handy when you want to claim a route, so you may want to grab it while you can. The only problem is that if you take a face-up wild card from the line-up you can't take another card. Sometimes this makes for some tough decisions!