http://www.menshealth.com/video?bctid=3002123580001#/video/all
https://www.youtube.com/watch?v=mRznU6pzez0
https://www.youtube.com/watch?v=HFzrFHqszQM
Can't go wrong with the basics Maddy. If you can do them, try pull ups for a moderately high rep range (8-12), with a priority on wide grip, but some close grip too.
If you can't do them yet or if you want to adjust the resistance, head to a lat pull down machine.
I'd also suggest incorporating sone variation of row into your workout.
Good luck!