So whats the easiest way to make money and which players should i be buying/selling ?
Sahin was a good one for me. I would search for Turks playing for Liverpool and put the buy it now maximum to 1.9k. I'd then buy them all and sell on for 3k+. Always sold even if they took a while. Just kept repeating that. Lisandro Lopez was another, and Afellay too (although he's not selling too well at the moment).
Another good way of making coins is buying cheap formation cards (gold shiney cards). 4-1-2-1-2 is a great one as loads buy those. If you can get any cheap, you'll make 5k+ on them by putting them back up for sale.
Managers too - most Prem managers can be bought for cheap by scouting around and looking for the ones with seconds remaining. Villas-Boas will sell for 1.5k+ and SAF/Mancini over 3k.
You could also buy premium gold packs using points (never use your in game coins, that's far too much of a gamble). Eventually you'll get a very rare card or even coin rewards in a pack. Can cost a bit of real money of course.
The final way is obviously playing tournaments and seasons offline to get winners money. Also go to the EAS store and buy the coin multiplier bonus which will add coins onto your winnings for x amount of games.