Warhammer 40K - Starter Set

In the grim darkness of the far future, there is only war. Across the far-flung worlds of the Imperium of Mankind, in a galaxy riven by warp storms and unceasing conflict, the armies of Humanity battle for survival. With the Imperium already standing upon the brink of annihilation, the Tyranid hive fleets emerge from the cold void between the stars. The Space Marines stand as the last line of defence between this ravenous alien menace and the beleaguered worlds of the Imperium.

Warhammer 40,000: Starter Sets – Your Next Steps - Warhammer Community

Decided to get into Warhammer and get a starter set please give me some advice on how to start and paint : r/Warhammer40k

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I need some help deciding what to do with the Crimson Slaughter