What ski length and ski in general should I pick?

Hey Everybody, I decided I wanna buy a pair of my first own twin tips ski. But I can’t decide which length to get.
I am 170/171 cm (5‘ 7‘‘) and 55kg (122lbs) at 17 almost 18 years. I have been skiing since 2020 I believe once a year. So my skills will be somewhere in the middle skill class to the upper middle class. I wanna get some twin tips because I wanna try a bit of the park like rails and stuff and little jumps on the piste. And to be honest they just really look cool.
I use them mainly on the groomers and also go like 90 km/h on the blacks sometimes but wanna get a bit more into park and side jumps on the slopes.
So I found the faction prodigy 1. They are supposed to be pretty good for the things I wanna do with them as I heard but I can only buy them in size 164. But I’m scared they will be to short for my size aswell because of the twin tips so they are again smaller. I found also some faction studio 0 in size 168 but they wouldn’t be really good for groomers right?

So I really need some help with first up which size and what ski‘s in general to get.