Dan Worrall explains various uses of side-chain filtering in compressors, using FabFilter Pro-C and its Expert section. The tutorial discusses compressing subgroups/busses and the master bus but also gives some tips and tricks about single channel compression of vocals, guitars, bass and drums.
In this video Alex Pfeffer is talking about the layering of legato patches from different string sample libraries.
Sam Hulick gives a brief tour of his go-to orchestral samples and also shows a little taste of the music for 'Conclave'.
In this video Alex Pfeffer talks a bit about different approaches on how to create a decent staccato strings pattern.
In this screencast Alex Pfeffer talks about a few basic things which should get you started to become familiar with Cubase.