Students need to be motivated to learn by engaging their interest and setting an appropriate challenge. Use images, video clips, pieces of writing etc etc to hook them in to the learning. Whet their appetites by explaining how they will present their findings in a novel and interesting way.
Students should then collect the information before they start to process it. The ideal here is to spend less time gathering information and more time thinking and processing it. To this end, it is sometimes worth giving them the information sources to sort, highlight, condense etc.