u/Lower_Milk_9323

I'm planning to participate in a smaller tournament in the near future and as I lack experience, I decided to ask for some tips here. I've played a few games of Combat Patrol only, nothing bigger yet.

I have the Chaos Daemons Combat Patrol, a Bloothirster and Be'lakor. The Bloodthirster is with the axe and lash.

My questions are:
Is it better to bring a Bloodmaster instead of something on this? I took him out in favour of flesh hounds.
How do I effectively use the big daemons?