how how to mix soil with perlite 50/50 or 80/20 ?

Hi,
I've bought Biobizz Light mix 20L and a bag of perlite 10L and 1L of biobizz grow to watering

I dont know how to mix it -.- can u help me?

I'm using some Real daylight, but soon I need to put em under the cfl's .

and I dont know how to add biobizz grow to watering,should I mix it with water,or i'ts enough to add a lil bit directly into the soil?

I was too convinced of what I was doing, please help me

no one can help me?