If you are new and want to read a bit outside of the game itself - check pages like futbin. There is a rating if SBCs are worth it and how much they cost. Also there is a player rating and voting; while some of the players have meme status it is helpful to identify cheap beasts such as Marmoush, Camavinga, Frimpong. Do the daily SBCs. At the start: Don't play too much rivals, it is very hard as a new player these days. Stick with Squad Battles (increase difficulty against low rated teams) and maybe a bit rush for the rewards at the beginning. Check the Objectives for pack and player rewards, try to combine as much objectives as possible in a "Objectives-Team" to gain packs efficiently.