Pack n play with sleeping newborn

I got this pack n play with changing table and bassinet . My question is should I use the bassinet for my newborn baby to sleep in at night ? It says in big bold letters infants have suffocated !! Also all it has inside is a bassinet pad, and can't find any sheets to fit it , are you not supposed to use sheets ? Should I just let my baby sleep in the actual pack n play , which can be raised to the top ?