I want to know the exact method of preparation and consumption of green tea. How much sugar can be used if recommended? Can I opt for honey instead? If so how much? How many cups can be consumed per day? 
It depends very much on what kind of tea you're brewing and what you want out of it. Green tea is a huge category of different preparations of the basic tea leaf.  Therefore, it's not possible to give a specific method. You might not like how I like my tea, and the chances are extremely good that you don't have the same tea leaves anyway.  Generally though:  If you're brewing from a teabag be fairly brief. Teabags contain very small pieces of the tea leaf, and will start to produce some very bitter flavours quite quickly. You might like these, but since you're asking about amounts of sweetening I'm suspecting you probably won't, at least not at first. And they do tend to get rather dominant, preventing you enjoying the full set of flavours of the tea.  If you're brewing from whole leaves you're in for a much bigger treat as the flavour will generally be far superior. The temperature of water used to brew your tea will change the flavour, as will the steeping time (typically in the 1-5 minute range). Many tea suppliers recommend temperatures from 60-90C for various teas - this depends entirely on the character of the tea, and you might disagree with what the supplier thinks is best. Do experiment. Personally I do use water at the hotter end, but I let the kettle sit for a bit after boiling so it's dropped away from that super hot water which is so beloved of the traditional British cuppa.  Also, for whole leaf tea, keep the leaves - you can brew them a second time, maybe a third time, maybe a fourth time, and it'll be a bit different each time.  If you find it too bitter or dry you can add a bit of sweetening. It's entirely okay to do this if you want to. I'd be sparing though, you can always put more in, but if you put too much in you've wasted the whole cup. Your choice of sweetening affects the flavour of course - honey tastes of honey, but it's going to need a more assertive tea to stand up to it (in my opinion at least). Simple white sugar adds sweetness with very little flavour. I'm not sure I'd recommend brown sugar for any tea, but something punchy (probably not a green tea) might be able to handle it.  You should also bear in mind that if a tea is too bitter, brewing it next time with cooler water or for less time (or both) should reduce that.  I'd also advocate minimal sweetening so that you can gradually cut it back and get used to drinking green tea as-is. It's better for you (no calories!) and once you've got used to the bitter elements there is a vast wealth of flavours to be discovered.  You might like some of the blended teas, too - jasmine tea is well-known, and a good jasmine tea is fantastic (it's basically a good green tea infused with jasmine flowers - a good whole leaf jasmine tea has jasmine petals in it). Green tea with mint (often called Moroccan Mint in the UK) is great, far more satisfying than plain mint as the green tea provides something for the bright mint to sit on. I've also had great brews of green tea with chrysanthemum flowers, white tea with rose (and black tea with rose, actually), and green tea with toasted rice (yes, really).  This all makes it sound a bit intimidating I guess, so the thing to do to start with is simple:   buy some good quality green tea leaves brew them for two to three minutes with water you've boiled and allowed to cool for a couple of minutes taste, think, sweeten a little if desired, taste again enjoy!  