I have several vegetable plants like cucumber, bell green peeper, okra, green beans.
I am starting them with seeds planted in small pots and then move them into gardening beds.
There is some insect or pest which is eating the leaves from the very young plants. What should i use to kill this insect/pest?

I have ordered this:
https://www.amazon.com/dp/B001D1H6SE/

from amazon.com.
Is this good enough or should i do something else?