You could start with a dead body, or a kiss, or a slap to the face.or someone puking, or wiping out on their bike. Action will get them hooked right away. Do not start with describing the landscape or the weather or the person. Something active or gross or naughty will get their attention. Try something like this
Jake's blood was dripping down his nose onto his T-shirt. He spit out clots of dirt, checking carefully for loose teeth. He looked down at his ruined dirt bike. "Just great" he said out loud , "Mike's gonna kill me, and if he doesn't, mom will. Oh well, anything was better than letting Mandy's dad get at him.
How does that sound for a first paragraph, got you hooked yet?
Well it's not as if there is one specific way of doing it. Some things you need to do though are establish you characters (who they are, what they like to do, who they're close to) fairly early on in the story. It helps a person want to read more if they become attached to a character in the beginning. Also try and lace in some humour - that's always nice to read about. Like someone else answered, a lot of people also use flashbacks/dreams/something not actually happening in the present moment to introduce the story. After that, there will usually be something that interrupts their thoughts and then, voila, dialogue. Hope this helps!