If you are selected to work in the field of university teaching how to find material to understand the students and make them benefit from lectures to

you must find your material by own search and by asking your friends in your spicialist about some information and material you can use some atlas and photos from net about your lecture and ask the students about the lesson and told them some stories about your subject and told them how they can study the subject and pass the exam

For Finding Materials you just want to Decide what subject matter you are teaching ? what is essential? what is important? and what is helpful ? remember don't use materials that are too simple with students they will likely become bored and stop paying attention.
but i think materials are last thing that you need to worry about , you should focus on relationship because students respond better ,work harder and achieve more when they know that their teachers are genuinely concerned about the success of their students prepares the environment,Students cannot learn in unorganized mess &effective classroom management transcends the rules and regulations so If you are relaxed in your classroom excited to be there and ready to work, your students will be too.
use the board (slides/overheads) to reinforce your points visually.use a computer with a projector.