Apps; Buying and selling badges and kits of the big teams is easy coins straight away. If you can get items under 700 for Arsenal, Chelsea, Liverpool, Man City, United, Inter, Juve, Milan, Barca and Real, you're in to make a gain of a few hundred each time. Most will go for about 1k. Barca and Utd items even more.
Marseille, PSG and Dortmund are sides that have items going for around 900 to 1k as well, so look out for them as most put them up very cheap.
Ziss; The IF's thing is stupid. A few hundred thousand more for an extra stat boost here and there. I think it's because of the card being so rare that makes people want to own them so badly.