Learn Serbian is a blog with lessons of Serbian (by Marina Petrovic). You'll mainly find short videos (and exercises) with different topics about the language. Also, Marina tells tips about the language and some useful links for learning Serbian.
Many lessons are fun and display real videos from tv or music clips. Here's an example, learning numbers with an hilarious gag about inflation: Practise Numbers in Serbian - Listening Exercise.
In her 'intro lesson' she advices:
I believe that the easiest way to learn a language is to be relaxed and eager to learn. Your actual feelings towards language learned will depend on your teacher and surroundings, to their attitude and their feelings - you will be just their mirror.
Therefore, I would suggest you learn bit by bit - small chunks of language, incorporated in short and easy to memorize sentences. Therefore, you will be able to repeat these simple things and motivate yourself by your own success.
Do not worry about the pronunciation. The aim is to say a word clearly enough, so that people understand you. That is an achievement in itself. In the course of time, your ears will get accustomed to Serbian, and thus, your pronunciation is going to improve. So pls, don't worry about difficult sounds like š, ž, ć, č, đ...it will come in time :)