A park ski would be a lot easier for you guys to start out with. Pow can vary so much and there is a lot of controversy/preference stuff going on with them. Park skis however and much more standard. Just make something with a nice average waste (80-85mm).
If you're asking me specifically, I like stiff skis with lots of pop. Possibly with carbon fiber stringers, but not necessary. Butter zones are NO GOOD. They create a weird flex that I don't like. I like it stiff underfoot with a nice progressive flex pattern with just the very end of the shovel being soft. Relatively same for the tails. A length about 184cm is good. I was skeptical, but I actually do like the slight "early rise"-ish thing Surface has going on with the Nine Life/No Time. But that is a "different" type of feature that you might want to stay away from for a first ski, or not, it's your choice. My main point would be to make it stiff with no butter zones.
If you want to do a pow ski as well, I would make it fat and rockered. My favorite pow ski to date is the Hellbent. I love the design. Maybe something like that just a hair narrower to cut down on the swing weight a little. Possibly 115mm waist-ish? A TRUE length (unlike K2s 189=194) of 189cm would be great. Also a shovel and tail slightly stiffer than the Hellbent would be sweet. Basically the same flex pattern, just tightened up a bit.
That is all my individual opinion but I still want to throw it out there.