Hi,
An advice 'what to buy ?' is always given on personal opinions. My opinion is Cubase VST is the best, easiest to learn sequencing-, score notation-, audio recording programm ever.
I started 15 years ago using PRO24 on an Atari ST and since then use Steinberg's updates to VST on PC now.

VST has a great 'mixing console' built-in, almost unlimited number of midi- and audio tracks. The max depends on your PC's power.

Roel