I need to start building credit and I would like to do it fast. I heard one way is to get this credit card that acts like a debit card. Is there? And also how can I gain credit fast?

It's called a "secured credit card." You pay the company an amount (usually $500) and they hold onto that $500 and then give you a credit card with a $500 credit limit. I'm pretty sure you get that money back if you ever cancel the card, but be careful - if you cancel the card, all of your credit history with that card gets wiped away - it's as if you never had it!