FUT measures player chemistry using different factors, such as nationalities, the league both players came from and the club they belong to. No chemistry will prove disastrous in a game, and you simply won't win many matches featuring guys who don't play nicely with each other; the motto of Fifa 16 Coins is play beautiful, after all.
The quickest way to earn money is by selling the valuable cards. In a Pack, if you've received any cards which is not much necessary like using in the squad then sell this card to earn a huge profit and try to build a team around it. Ultimate Team is all about the chemistry between the player instead of just collecting the star players. It's good to sell the card and higher a better team.
However this method can be effective if done cleverly. At this early stage of FIFA 16's life cycle, contracts and chemistry styles are fairly valuable, therefore if you can find a player with lots of contracts and a valuable chemistry style, such as the hunter, then you may be able to make a profit on Buy Fifa 16 Coins them, although these profits are likely to be minimal compared to the BIN sniping method.
http://www.fifaeasy.com/Fifa-17-Coins/
