Okay well I bet all of the stuff I am about to say has already been said but...
1) Game shape, ya gotta let your star players rest some times, and let your bench warmers play to keep game shapes high
2) Save your money, you say you spend all your money on players well save up around 1 mil - 1.5 mil and buy maybe 10 k player. And instead of buying two 5 k sal guys, buy 1 10 k guy works much better. You gotta stop buyin crappy players. And i know look who`s talking but i have lots a money in the bank.
3) Expand your arena, for noobs one of the most important thing you must do to turn into a good team is to make money, you do that by arena revenue