You may have noticed in my overview of the Amazon Associates site that I left out the mention of the plugin they built for WordPress. That’s because the plugin doesn’t work (at least not well). Luckily, the Amazon Auto Links plugin will simplify the process of finding new and relevant products to promote and creating affiliate links to them--all from within WordPress.
You don't need a tool, you need a good strategy. You have few products ready to be sold, so, to complete the process you need a traffic and conversion. You can have some paid traffic from social networks, search engines, forums and other advertising websites. For the conversion you need a well built website and attracting products that your visitors will want to buy.
When I say that I love Wealthy Affiliate, I’m not just saying that because I’m an affiliate for them. I’m a very active premium member at Wealthy Affiliate and love interacting with people on a daily basis. If you join, you’ll see me posting on people’s profiles, answering questions, chatting in the live chat area, and I have private personal messaging conversations multiple times per day.
Hey. Yes you can use just one website to promote multiple affiliate programs, but I’d say that your website should focus on just one niche. So you mention, SellHealth, that would lead me to believe your site is about health and fitness. I would then advise you to stick to that niche rather than promoting unrelated products like dog leashes and fashion accessories.