Business Research & Reselling Market Analysis

I am looking for a freelancer with experience in e-commerce, product research and reselling.
I want to test a small reselling business focused on profitable products in the Italian market.
The freelancer will help me:
identify products with good resale potential;
research current market prices;
identify potential profit margins;
analyze competitors and demand;
create a simple buying/reselling strategy.
The initial test budget for the business is €300. The objective is to identify opportunities where products can be purchased below market value and resold at a profit.
Please provide examples of similar research you have completed and explain your approach.