How could 2 people stay in tokyo for cheap?

Question:

Me and my friend always travel together,the only place we have't gone is to japan.and we really want central tokyo!but we can't speak japanese..and we plan on staying in 1 place this time..questions: how much for airlines,food,apartment(or house),billing,school(if needed),fun time^^,ect... also can teens get jobs?and as what? How do I translat there language the easiest..do we need a visa?!I want to stay forever..not just for a limit on time.
Please answer ALL questions I really need the cheapest posible way.thanks and no bad coments!

Answer:

Air fare: You need $1000-1500 if you are departing from US

Hotel: Usually, you need $120 per night if you want to stay at a hotel.
If you want to save money, you need to stay at a hostel which will cost $40-60 per night.
If you want to stay at a luxury hotel, you need $250-300 or more.

Food, transportation and others: You need $60-120 or so per day. If you want to enjoy shopping, you need more.

So you need $120 for hotel and $90 for others per day. If you want to stay in Japan for 2 weeks, the total cost will be $2940.