I'm Looking for Advice: Thinking About Using FBA/Private Labeling etc

So, I am entirely new to the idea of 'private labeling'. I've been reading up on it and have decided that I want to test it out, but I cannot find any decent tutorials etc. that really go in-depth on the topic. Sure there is a ton of videos and how-to's, but none that, I feel, adequately teach the subject past what is obvious for any business.

With any type of investment that I'm unsure of I am severely skeptical and don't tend to invest at all, but I want to learn more about this and even attempt at doing this even if there is some loss so that I may learn.

If there is anyone knowledgeable and experienced, who wouldn't mind commenting or even sending a private message (preferred) of decent links or how-to's, really just any in-depth walk-through(s) of setting this business up, even if it is old data that is out-dated or non-profitable fail data, anything would be extremely helpful.

Thanks everyone in advanced.