Cooking frozen Pizza in the microwave
No, you can't bake pizza in the microwave. See Why do my pizzas get such hard crusts? for details. The short answer: it gets as hard as brick. 

I won't say that baking a pizza with a stove and a grill is impossible, but it is definitely not something for beginners. So this, too, is out. Really, a pizza needs an oven. 

If you insist on pizza, the cheapest way is to buy a toaster oven. They start at 50 €. 

If you just want to ease into cooking by preparing pre-made food, look into frozen pre-seasoned vegetable mixes for the pan, or fresh dumplings from the refrigerated goods aisle, or noodles with easy sauces. All of these can be prepared without an oven, and don't need much time or cooking knowledge. They won't let you experience all the benefits of home cooking, but neither will frozen pizza, so this is probably not a problem in your case.