Basic Bosnian/Bosniak language resources

Not knowing the language when hitting the ground will be difficult, but here is a free multimedia web resource for learning basic phrases in Bosniak:
http://www.101languages.net/bosnian/

The fact that the language has been politicized as a result of the Yugoslav civil war makes it difficult for a non-native speaker to understand what all the fuss is about. Without knowing anything about the language yet, I wonder what differences there are between Bosniak, Croatian and Serbian. Obviously, Serbian uses Cyrillic writing, but are the other differences between the languages anything more than what we might call an accent, or a preponderance of different word choices (similar to spanner: wrench, elevator: lift) or idioms and slang?

Here's a brief explication summarizing some of the variations between the three:

http://www.omniglot.com/language/articles/serbocroatian.htm

That being said, here's an "old school" Serbo-Croatian resource, the US Foreign Service Language Course, complete with two PDF manuals and downloadable audio:

https://www.livelingua.com/project/fsi/Serbo-Croatian/

Another manual on the live lingua project website comes from the Defense Language Institute, a place I once called home (a lifetime time ago, when I was in the US Army studying Russian in Monterey, California.) This one's apparently just Serbian, so unless you're planning to spend a great deal of time in Republika Srbska, and need practice with Cyrillic, I'd stick with the first two links.

https://www.livelingua.com/project/dli/Serbian/