You need to have A LOT of players in your club to raise your club value to 85 million.
For start you want to buy bronze packs - keep every player, other cards quick sell (you can apply contracts). Having more and more bronze players in your club will mean that you will get a lot of duplicates. Then buy cheapest silvers and gold ones on the market (max price 250 for silver rare, 300 for gold, 600 for gold rare - if you get duplicate, you can quick sell without loss).
You can calculate individual value of each player this way - mark down your club value (leaderboards), send the player you want to know his value to trade pile, mark down your new value.
Individual value of that player is the diffence between old and new club value.
Values are about:
BRONZE - 55.000
BRONZE RARE - 130.000
SILVER - 80.000
SILVER RARE - 185.000
GOLD - 140.000
GOLD RARE - 265.000
Individual value can vary - depends on quality of the player (for example Ashley Young's (GOLD RARE) value is 307.063).
EDIT: Another way is to buy Bronze Rare players on market for 150 each. Going on this way now, seems even better (have many duplicates in bronze packs)...