Hi Japheth and welcome to the forum,
You have clearly identified a few areas where you have gone wrong, but the positive is that you have the ability to identify. If you can do that, then you also have the ability to learn from your errors in moving forward.
One thing that stands out to me from your post is that you may not yet have a good grasp on different pricing structures between dropshipping and actual wholesale, which are completely different. So you may find this interesting.
general/what-s-the-best-supply-resource-for-me-t15293.html
I would also suggest having a read of this as well, it might help you understand how pricing works on sites such as eBay
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