A few queries

Anany Agarwal (19 Points)

28 September 2016  
please answer my following questions in detail:
1. How can i know which firm is apt for me?
2. When i have selected a firm, how can i know if there is any vacancy available?
3. How to approach the firm regarding doing articleship, through mail, or manually?
4. Where to go, in Big4 or Other Big firms, or Mediocre firms? Please discuss the Pros and Cons in detail. I kindly request you to answer this in very detail.
5. Is it so that in Big4 we will have expertise in one field and absolutely no knowledge of other field?
6. Can I ask my principal for increased Stipend?
7. Any other information regarding articleship, please mention. 
Thank you so much