You can find free work at home ideas when you go to a search engine and search using relevant keywords. There is almost limitless information and resources to help you nail down a concrete idea and to run with it every step of the way.
One way that is tried and true is doing eBay auctions. Some start very casually just to clear out closets and storage facilities. Many items you don’t need any more, may be of value to someone else. eBay has full instructions on how to set up your own auctions and you can elaborate on that as much as you want to as far as adding bells and whistles and promoting your offerings.
If you like that business model, you can find companies online that need distributors. You can auction their products for a profit. You can sell just about anything — clothes, jewelry, electronics, arts and crafts, health and beauty products, et