If you want to learn the Korean alphabet once and for all and not to get confused by all the similar-sounding sounds, then defintiely reach for Hangeul Master. It will teach you how to recognise and write letters, as well as teach the individual pronunciation an the pronunciation of specific clusters. You will also find examples of different styles of handwriting specific syllables, which will help you in developing your own way of writing by hand and in reading letters or notes written by your Korean friends.
As is the case with all titles published by TalkToMeInKorean, you can listen to the audio material spoken by native speakers on their website, which is vital while getting your Korean language basics.