Dic: for starters

• If they want to be involved, for starters, they might join Saturday's antiwar protest downtown.
• You've got to put down a deposit of $500, and that's just for starters!

1. as a beginning. (= for openers)
   
   Usage notes: often used in the form that's just for starters:
   
   
2. for starters: (Slang) in the first place.

.... Cambridge Dictionary of American Idioms, Collins Essential