You can find dividend stocks using Google Finance Stock Screener which is free to use. Set the search criteria for the P/E Ratio, and Dividend yield (shown as a percentage) criteria. You can set minimum and maximum values; in the dividend yield box, set it between 2 and 100. This will search for stocks that pay dividends worth between 2-100% of the current stock price.
I would honestly just start with Amazon if you’re looking to sell toys. As your website gets more traffic, you can start looking into other retailers. Once you have traffic and some conversion data from Amazon, you will likely be able to broker private affiliate retails with a few toy retailers. You may even be able to help them set up better funnels in general that lead to better conversions. Once you have the traffic and conversion data, you’re in a much better place to negotiate
Selling T-shirts and other apparel is a pretty saturated market but the tools to do it are easy to use, which makes it very quick and cheap to get going. If you’re creative enough, or tap into the zeitgeist properly, you can also have a runaway hit. Even if your first 19 T-shirts don’t sell more than a few copies, your 20th might make up for everything.