Which module to use?

Hello, I have built greenhouse beside my house. Now I plan to put arduino uno in it with DHT22 sensor to read humidity and temperature. Greenhouse is around 5-10m from router in my room and it has wall or two between them. I also wanted to put some wifi module to send readings from DHT22 to my phone application. Arduino uno would be connected on 9V battery.

I have few questions: a) What wifi module to use? b) How long would one battery manage to power supply that? c) Is there way with interrupts to prolongue life of battery (if needed)? d) I guess I would need some online storage to send that data to, and my phone to collect it, can I use something like dropbox or there is something better and easier to use?

Thank you in advance.

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