Obviously, exploring previously done research and asking new questions on the basis of their finding to test new aspects is the key for the start of the new proposal. But, here are some references:
Yes, as Entomology itself is a vague you should narrow down your research interest to some level such as pollinators, industrial insects, pests, predators, parasitoids, or some group of insects with taxonomic interests. That helps you to search the journal articles from google scholar, I guess. All the best for your upcoming proposal.