1) Do it right. If you are planning on taking short cuts, don't even bother with Ebay. Shortcuts are for losers.
2) Take the time to provide good scans. If you are selling a card with a white border, use black paper as a background. A white card on a white background is pointless. I can't see what your item looks like. Why would I bid high on such an unknown entity? I might make a lowball bid and cross my fingers. I have won lots of really nice cards this way. The bad scan scares off other bidders and poof... I win what turns out to be a real nice card for peanuts. The lazy man gets less, which is what he deserves.
3) Using all capital letters makes your listing difficult to read. Do not use all caps in your title. You might think it makes your item stand out. It doesn't.
4) Luck is for losers. The harder you work, the luckier you get. I've been told that I'm "lucky" because Ebay provides me a nice 2nd income. This offends me. I put ALOT of time into this because I believe in doing things correctly. I'm successful because I do things correctly. Cutting cardboard and sandwiching Baseball cards between them prior to mailing takes time. I do this because it is safer and cheaper. Because it is cheaper to ship a card this way, I can afford to charge my customers honest postage.
5) Honesty is good for business. Long term business. Accurate descriptions, honest shipping charges and a good return policy... If you can't do these three things properly, you have no business owning a business (FYI: selling on Ebay is a business). I offer money back to my (very few) dissatisfied customers. Included in this guarantee is money back on all postage costs incurred. Yes, I stand to lose money but if the customer is unhappy it's because of something I did wrong. Why should he have to lose any money at all? If I screw up - I pay. And because I do things the right way this return policy really doesn't effect me. Maybe once or twice a year, if that.
6) The only way to be successful is to fail occassionally. Trial and error. I've heard from too many people that you can't make money on Ebay. You tried to sell something and it didn't work out too well? The loser will give up on Ebay and swear that it doesn't work. Don't give up. There is an infinite amount of money to be made here. When you finally find the thing that works for you, Ebay is real good. Nice to be able to work from home. Key word to the previous sentence is "work". The harder you work, the luckier you get. If you're looking for "easy money", go buy a lottery ticket.