stocking up on diapers

Shyna • Capricorn with a Scorpio.
I want to cloth diaper and I also want to stock up on honest diapers, just in case cloth diapering isn't for me. I'd like to know how much of each you mamas think I should start purchasing. I want to avoid the diaper runs. This is my first child so I am not sure how many disposables I would go through or how many cloth diapers would be a safe amount (if I exclusively cloth diaper). Help a mama ouuuut.