How can I get free resources for making products to sell?

This depends on what you want to sell. If you want to sell clothing items or other things with your own designs on them, you could start with a print on demand site like Zazzle or Redbubble where you provide the design and the vendor prints the product to fulfill orders. You will get only a percentage of the profit, but you do not need to pay anything up front or to keep your digital store open on these sites. If you are making a physical product and are looking for free or cheap raw materials, try garage sales or Craigslist. For example, you may be able to get free lumber that someone is looking to get rid of.