try to farm rest pack everyday by watching free video,
always make sure your 1st 11 player condition more than 90% or at least not lower than 85% before match.
you shouldn't force your 1st 11 to train so hard until they almost dead.
they will surely die during the match by heart attack or something.
anyway, try to get mature 5* player in your squad age around 27~29 especially at midfield as beginning for you to understand this game.
if you bid those 5* player at auction, try not to over bidding them, if somebody bid more than 10 tokens, you should give up the bidding war,
there are plenty of 5* players with cheaper price will come out