I usually offer 4-6 tokens to other managers, about 50% of the players i offer for end up being in my team..
Go for 18-19 y.o players, they cost 9-10T as starting price, highest you should pay for them is about 17-19 tokens.
Sometimes i offer 2-3Tokens then the managers sets a fixed selling price and the range is about 5-6Tokens + Money..
It all depends on how important that player is for his team.. Trying to buy a player from a higher level may be cheaper, even if you offer like 2-3Tokens the manager is going to accept most of the times.
My team:http://www.topeleven.com/manager/p/B...AwNTYwNzM1MTQw
Road to the Treble & How to win the Cup: http://forum.topeleven.com/tutorials...xt-season.html
Top 10 Formations & Tactics Guide:http://forum.topeleven.com/tutorials...ics-guide.html
Those guides are based on my personal experience and other managers suggestion/feedback