Im looking for a song, that can be played on an acoustic guitar, is more technical (where you have to pick different strings, not play chords), is not too hard for a begginer and sounds good (and has a tab on 911tabs.com )

South of Heaven by Slayer is acoustic-viable. It sounds fucking evil too.

Dokken -Tooth and Nail (acoustic version) its easy enough that you can sing along while you play if you want. Awesome.