sounds like you're REALLY, REALLY not ready for the park and if your "go to" move to stop is wiping out and you're" not in complete control of where u want to go", then you have a LONG way to go before you even think about the park. basically the park is for people that just cruising is just way too easy and boring, that they need something more.
all the etiquette that "Jed" posted is great! beginner parks are not the place to learn etiquette, most of the people there have no clue there there even is park etiquette. if you ever do dare to even cruise down a park trail, PLEASE, PLEASE be aware of everyone around you because in the park, the person in front doesn't necessarily have the right of way.
stay out of the park until you're linking turns without having to thinking about it, be comfortable some flat ground tricks.