I can assure you this game is totally playable without spending a dime. You actually learn more things that way and understand the value of things more. Usually the first seasons are easier (at least have been for me). You don't need to invest a crazy amount in players, keep your team with mostly 5 star players, even older ones. During your first 3 seasons make sure to not spent a lot of packs and create a reserve for yourself, believe me it is worth it more to spend 15 packs and save the other 15 in your 'bank'. Only train young U21 players, you don't have to be to greedy and make everyone a world class player. I'm sure you will find a balance yourself and work things out, one week is still early, don't be discouraged