Small cell lung cancer?

i was talking to a friend of mine the other day, He's just been diagnosed with small cell lung cancer and i have a few question but i feel like if i ask him he will think im being rude or nosy but im just interested and i want to support him without making him tell me all the little details that may upset him.
Here are my questions;

How long till he gets the chemotherapy and radiation chest thing?
How long will the treatment take?
Do you have to stay in the hospital throughout the whole treatment?
Will he be able to use his mobile if he does have to stay in hospital?

All i know is that he's got this cancer and its at a limited stage.
If anyone could answer any of those i would really appreciate it.

Do you know what the life expectancy is? his 16 years old, and its at a limited stage? also with treatment

What Kind Of Diet Should I Go On?

Well im 17 & i weigh (gulp) 256 D: <----- I know thats bad! but i wanna start a diet asap i need a good diet plan & like anything willing to try anything! ive always been heavy but this is the heviest! please help & be nice (: thanksss!

I think I have depression?

I feel very alone recently, i've put on a lot of weight, I have no self esteem, i'm not performing at work, and quite frankly, i'm very unhappy. I don't know how on earth to go about this, what I should tell a doctor, and what will happen?
Thank you in advance for your answers