You have some great ideas for your product lines! The BEST products to sell when you're getting started are those that you already own but don't want anymore. It gives you real experience without risk and you make 100% profit. And selling info-products, if marketed correctly, is THE way to go online in my opinion.
Just because there doesn't appear to be a market for your info-products on eBay doesn't mean there isn't. With something like 80 million users, there is a market for virtually anything. In fact, if you find out there is a potential market for your product you're in better shape than most. Ideally, you want to be the ONLY one offering what you sell. And you want to sell something that you not only have specialized knowledge in, but that you are passionate about as well.
So if you have specialized knowledge from your line of work and can use it to sell something that will demanded on eBay, sell it if you enjoy your work, but don't sell it if you HATE your work. As tripe as it might sound, you are much more likely to stick to something and succeed at it if you are enjoying what you're doing.
Do some research with search engines to try to see if there are any websites related to your area of expertise. You do want to be careful to know there WILL be a market for what you sell before you spend a lot of time producing it. You should never stop learning about your niche (what you specialize in). It's not enough just to have specialized knowledge. You need to keep up to date on prices, trends, new products, etc., pertaining to your niche.
As for specific selling tips, there are dozens of "eBay books" that teach you how to sell on eBay. Most of them only cover the basics, or are recycled and out-of-date, or are junk, or all of the above. A couple of them are actually useful. Don't waste your time with any of those "101 eBay secrets" or "eBay marketing tips" manuals. Those are almost always junk. In fact, a couple of them blatantly copied a short guide I wrote more than 3 years ago - so they're obviously way outdated today. Also don't waste your time with anything that tries to sell you with a lot of hype. The "make $5000 per week on eBay in your spare time" ads are 100% BS. It takes A LOT of work to run an "eBay business".
For starters, I'd read Don Lancaster's free eBay secrets manual at http://www.tinaja.com/glib/myebays.pdf. It's a 4-page guide with many basic but very helpful tips. While I don't entirely agree with everything written (i.e. I welcome non-Paypal payments and non-U.S. customers), this guide is very well written, not sugarcoated and is a good place to start - and decide if you want to are sure you sell on eBay.
Also, I have a lot of basic eBay seller tutorials and articles posted on my website (see my signature) that might be helpful to you.
Lastly, if I could give one piece of advice to someone who wants to sell on eBay and as heard all the hype, it's that eBay does indeed take A LOT of work, and it is the furthest thing from a get rich quick scheme. However, it is a great opportunity to make money at home if you do it right, involve yourself in it 100% and make it enjoyable.
Good luck on eBay!
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Timothy Mina - www.online-auction-expert.com
Help for sellers at eBay Online Auctions. Free strategies, secrets and tutorials to help you ELECTRIFY your profits on eBay.