1. what to mine and how to mine and what to expect. (I am unclear on where to start)
Started from you reading about Mining types (like Mining use hardware or Cloudmining), Pools of Mining. 2. I also want to know how to find out the hash rate of a device.
2. you can go to this : https://whattomine.com/4. Suppose I start mining coin 'A' and then I want to mine coin 'B'. Is it a good thing to switch? Is is even possible to switch like this?
4. Yes, maybe if you think a coin 'A' profit is low than a coin B.Reagrding Question 1 I will go for the use of Hardware and than maybe pool later. I don't have any plans for going for Cloud Mining whatsoever.
2. Thanks for the source. Also if you can enlighten me about the temp and clocking the device? I have read somewhere that the clocking to device also effects whattomine
(You see what I did there? No, Ok I will stop) 
4. My point in this question was what changes will I have to make if i want to shift from one coin to another.
2: temp and clocking depend on exactly what 'device' you're talking about - ASIC, GPU, CPU are all very different, but could be used to mine, depending on what algo you're aiming at. Each GPU has it's own optimum clocks, which you'll have to test.
4: Ditto. Depends what hardware you're running to begin with. Might be as easy as clicking a toggle in your pool settings, or might need you to trade/buy a coin that you can't mine with your hardware (eg: you have a gpu farm but want BTC). Switching is all very well, but there are many hidden variables, such as pool payout levels, time taken to setup and optimise, and the fact that yesterday's great idea might be todays awful one, because everyone else has done it too.
2. I will be using GPU for mining and won't go for Bitcoin as I feel that it is already too crowded to be of any good. Also I have read that AMD is better than nVidia as it is cheaper and good for coins like Ether/Ripple (Sorry for taking names
)4. I will be using GPU and won't be joining a pool any time soon. I don't know that many people and I don't trust websites that much as well. Also I don't want to wait for my payouts and risk the fact that there are a lot of players who don't give you the payout when it is time. I would love to look into the toggle thing, please guide me with any resource if you can for the same. Me is saying this is because I don't want to be stuck with today's great idea which eventually turned into tomorrows' blunder
Thanks in advance.
2) Good, GPU won't mine BTC or Ripple (for different reasons). What are you planning to mine? That will dictate whether AMD or Nvidia is 'better'.
4) Um, well, if you don't want to use a pool you'll be solo mining, no toggles. No payouts unless you hit a block either.
Basically, you'll need to get Googling - most of the answers are out there, you just need a step-by-step approach. Suggest starting at the difference between solo mining and pool mining, and the various algos you can mine with GPUs.