You don't have to spoil a question of how to win at blackjack! I will admit that if you don't have experience the game can flummox you though. I recommend looking up a free blackjack simulator online and just playing a couple dozen games.
Ultimately think of it from a basic adding exercise. If you have a 10 and an 8, the odds of drawing a card that will put you over 21 is very high. Generally you can play blackjack one of two ways; defensively, sitting on 17-21, waiting for the house to bust, or offensively, taking risks to try to eke your way as close to 21 to put pressure on the house. Remember, the house MUST draw cards until they're at 17 or over.
House has an advantage with the face down card which is where the gambling aspect comes into play. For example if the dealer has a 6 and a face-down card, then you can take the gamble that perhaps the dealer has a 16, which is not the most enviable position to be in, and then you can choose to play defensively accordingly, hoping that the dealer will bust since the house MUST draw until they're 17 and over. But if the house has a King and a face-down card, then the gamble gets tougher, and you must choose whether it's worth taking the risk to try to overcome the house.
There's obviously more layers than that with card odds and such (~38% chance of drawing a 10-11 value card, which gets lower as more of those value cards are revealed), but Kiseki Blackjack is simpler than the real thing, so I would just stick to basic strategies and go with that.
EDIT: Beat Halle on my first try, sure there's some luck involved like all gambling, but if you play the basics I think your odds improve quite a lot. By the way, I hope you know how to play poker...