Don't worry about being seen as too biased as you are supposed to be biased. Then, once you feel comfortable publishing an ezine, it is time to move onto the next step in your digital publishing career. Create your own electronic book. Digital publishing of your products has additional advantages to information publishing in general. First of all, you have no publishing cost except for the software to create your manual in the first place.
Digital products have no fulfillment costs and no shipping costs.
Just think what you would lose on that including shipping and product costs if the order came back as credit card fraud. Digital products have a final benefit that in my opinion outweighs all others. You can have the product sales done by secure order form, processed in real-time online, and the product instantly delivered to your customers with ZERO involvement on your part. You could have several products all selling from different sites all being automatically processed without you having to spend any time with them whatsoever. The money would keep coming in while you work on new projects, go on vacation, or spend time with your family.