1. The batting cage idea is very risky. I’ve seen many of them close over the years and it is not anything close to passive income if you want to keep the business going. You have to continually promote it and target youth leagues, coaches, schools etc to catch all of the new players who grow up and want to play. I’ve played at probably 8 batting cages over the years and 7 of them closed.

However, you should pick a niche and blog about that. If you're launching a money related blog, maybe it'll be about how to make money in real estate or simply how to make money online. Pick the niche and stick to it. If it's a diet and fitness related blog, maybe the niche is the Ketogenic diet, the Atkins diet or some other form of diet or fitness.

Establishing residual income allows you to accumulate wealth faster, have a more flexible lifestyle and maintain a diverse financial portfolio. As with any successful investment, hard work is required. With residual income, however, that work tends to be upfront. Once your revenue stream is established, the work and time involved is significantly lower than active income sources. With residual income, you’ll secure funds for your future, have a better idea of where you stand financially and enjoy peace of mind knowing you’re maintaining lucrative, long-term investments.  
Part of providing value is building trust. Don’t link to things that aren’t of good quality or people won’t trust your recommendations. The other part of making an audience is consistency. It matters less how often you post than how consistently. If you only have time to do one post a month, that post should come out on the same date and time each month.

The beauty of passive income through online courses is that it has huge scalability potential and you earn no extra expenses for more students enrolling. Online courses are conducted through digital study material. Students simply pay to access and view. So whether you sell a course to 5 students or 500 students, it doesn’t cost you extra (aside from the time spent promoting your course).
An email marketing campaign is not as difficult as it sounds!  Email marketing is still one of the most effective means with which to drive traffic to your affiliate sales pages.  Also, this will help you appeal to a bigger audience. It is done via regular newsletter or autoresponder (time-based email series) about your service or the product you offer. You can also offer some free advice on marketing or tips of the business. You can offer a sneak peak to the whole product to generate traffic. Additionally, you can learn to create a “sales funnel” that provides value-added products combined with a possible sales pitch.
Residual income is calculated as net income less a charge for the cost of capital. The charge is known as the equity charge and is calculated as the value of equity capital multiplied by the cost of equity or the required rate of return on equity. Given the opportunity cost of equity, a company can have positive net income but negative residual income.
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