Hi again Diego. I can say from experience that newts in general are not "easy" to care for (like a cat or dog) and live plants can be pretty tedious too. I only been keeping newts for several months now and I've run into many problems.
1. Although cynops orientalis are by far the most common, I haven't found them the easiest to care for. I spent a very long time preparing to bring my newts home. When the day came for me to go pick them out, I picked out one nice plump one, and two babies (because they were so cute). Well, they were cute. However, I spent many, many hours trying to save their lives. Unfortunately, disease had already sunk in and I didn't even know it. I did my best, and still had to watch them suffer and die.
2. Even with live food, getting your newts to understand your method of feeding will probably not be an easy tank.
3. Live plants are better, in my opinion, but I had entirely too much time on my hands, which is the only reason my poor plants are still alive. I'd recommend seeing if Mom has any houseplants that she thinks will grow in water and trying those. My petsmart plants are long gone, except for one. They require lots of pruning until you finally get them growing good.
Sorry for the long post, but you seem pretty interested so I thought I'd share a few more things with you. Good luck!