To begin, I'd cut off those leaves and throw them in the trash. Look at one under magnification to see if you can identify the insect. Even if you can't, a good spraying would be the best thing to do. I use AgroMagen GrowSafe, but there are other possibilities. There are folks here who are better with insects than I am.
me as a new grower myself want to save all but the problem this early will carry forward rather than b a mad scientist all over the place I would restart