Find the “It Card”
The “IT” card is the one card that you will always be able to sell for a decent profit margin. Everybody has their own “IT” card which they will constantly trade in, to make money. This technique particularly works with lower value cards, as there will be more of the card on the market, meaning you can buy a higher volume of the card, and the tax is generally less than 200 coins, meaning big relative profits are available. By researching the market and finding your “IT” card you could make a good start with Ultimate Team, which will help you towards making your first 50k.
Example
In Fifa 11 Ultimate Team my “IT” card was Paul Scholes CM, who would always sell for 1800 BIN, and yet you could very regularly get him via bids between 1000-1200 coins, leaving a 510-710 coin profit, or 30-40% profit margin, on a single card, a huge profit margin. We traded this regularly making our way up to around 50,000 before going on other money making ventures. Don’t forget the “IT” card is the 1 card which will always guarantee you profit and isn’t really affected by market fluctuations.
As you can see for the picture above, my "IT" card this year is Mario Balotelli, which you can regularly buy for 1 - 1.5k, and sell for 2-2.2k BIN, leaving you with a very high relative profit of 40% for Fifa Ultimate Team.