OK, go to a shop give them height weight and everything they ask for. Tell them that your a beginner but you are skiing park. park skiing will boost your din a bit so you don't wanna just say beginner intermediate. Just tell them what kind of stuff you do they will set it.
If you find your ski is coming off when it shouldn't a lot. raise your din by a 0.5. then try it. repeat process till you don't prerelease. This should only be done if you know what your doing, know when your ski should release and when it shouldn't, and are will to accept the consequences of blowing your knee cause you messed up.
NOTE: Bumpin up your DIN does not make you cool, a lot of people do it who shouldn't, and it can be an expensive mistake.
...sort of like cigarettes lol