Individuals or startups often look for people to review their products to encourage others to buy them. You can either get started with a profile on freelancing websites or approach companies directly, offering them a review in exchange for a monetary reward by becoming an influencer. Even better, if you have your own website or blog, you could write entire posts about their products, thus allowing you to charge more money in the long run and build a portfolio with tangible results to show future clients.
Where the equipment you use in your business was acquired as a gift, you may report your estimate of its current market value on the Business Property Statement (that is, what you think it would sell for in the open market place). Enter that estimated value in the most current year's cost line and add a note indicating that the entry is an estimate.