Where can i go and buy stock?   

I am very new fellow to this stock market. I only know when the stock goes down buy it and when the stock comes up sell it. I know just this simple principle doesn't help me get success on the finincial market. So i want to quench my thirst of financial market with the following questions being answered.

Could you guys suggest me on the following details? :

1) Where can i buy stock online? Or I need to be present on the physical location?

2) How much time do i need to give for watching the rise and fall of stocks? I am currently working 8 hours shift (Mon - fri), does my participation on stock market hamper my regular office hours?

3) Any news channel , online channel to watch stock?

4) Is Buying and selling goes every minutes, hours or its a daily or weekly process?

5) Do we need to search people to seel the stock or just a click on internet will do for us?

6) Is it easy to sell the stock at any time we want no matter whether its up or down?

Since, I studied on Nepali-Medium school I find little confused with complex words or certain financial terms. I would appreciate if you guys put brief meaning on bracket if such financial terms are used.