Replying to Help a noob out please

Hey, this is my first post ever on here. So basically I've been skiing for about 9 years, and id like to say im decent at it. I've never done park skiing, and i want to start doing park skiing. I dont have twintips, would it be a good investment to get some? What should i start off learning trick wise? I can already ski switch, and i can 180, but thats about it. Should i build a ski setup in my yard to start practicing? Thanks for the help