for starters

Từ điển Oxford Advanced Learner 8th

for ˈstarters idiom
(informal)used to emphasize the first of a list of reasons, opinions, etc, or to say what happens first
•There are a number of problems— for starters, where is the money coming from?
•The winners will be flown to Paris— and that's just for starters.
Main entry: ↑starter_idiom