[Starting project] 2D pixel art gestion game for tablet

Hello,

I am starting the pre-prod of my student project which will be a 2D gestion game, with a game design in the kind of the games that Kairosoft makes for iPhone (google "Game dev story" if you want to know what it's like).

I'm pretty new to Unity, and I am wondering how to handle this kind of 2D pixel art games and I never developped for mobiles or tablets (I'm not making 3D iso btw, only 2D from side view).

So if anyone has some advice or anything to get started the good way, it would be awesome. Thanks

And if you are wondering, in this game you have to manage an undersea shop with human-fishes