All the info to get you started is right in this forum. Like you said, there is a TON of info, so just start out with something that interests you.
Do research on that subject, go to ebay and do completed listing research, that research will probably turn up new research to research ( at least it does for me ) Then when you think you know what to look for, go hit the streets.
Start looking at the quality of items. Pick stuff up, feel the weight, learn the the types of materials that the items are made of, where they were made at.
When you look at an item, don't think " oh how much can I sell that for ", ask yourself other questions like, can I find a customer to buy this item? Who would buy this item? Why would they buy it? When you start asking yourself these types of questions you will start finding more and more stuff will jump out at you.
When you are out and about and start seeing a lot of on type of thing, write it down and research those things to see if they are selling.
Also when researching prices, make sure you understand why they sold for what they did. Like diggumupp said, condition, condition, condition.
