Tots is an event in Fifa ultimate team (fut)
Fut is a game mode where u collect trading cards to build your dream team. U play match and trade to earn coins to get player cards.
Fut have a few modes inside. Offline modes like squad battles and offline seasons don’t need ps plus. Squad battle is where they will randomly assign you 4 teams  to play each weekday (12 on weekend). Depending on where u finish, every week got rewards.
If u want online seasons or daily knockout tournament (dkt)then need ps plus. 
If u can win dkt then u qualify for weekend league where u can win nice rewards depending on how well you do.
Btw good to start now in World Cup mode. This is a new mode similar to fut but u collect World Cup player cards. The mode is separate from fut. so everyone start from scratch