This isint as much a guide as how I got it. People seem to pay more for low level gold known players rather then anything else players like beckham, gomes(tottenham keeper ) ramsey, players around levels 75 -80 are normaly cheap to pick up. If you dont sell them first try eventually you will. As you get more money buy bigger names I made 7k on berbatov and paid 3600. When you do have enough coins to buy a player for 15 k make sure its buy now I bought gervino for 17k but wasent buy now. I eventually found dzeko for 15500 buy now bought him achievement unlocked.