Welcome to SaleHoo, Mark!
Fudjj is right, RESEARCH is the key to success! So even if you don't like you will have to do research :)
And keep in mind that eBay has become an extremely competitive marketplace and it is not uncommon to find products selling at prices the same as or lower than wholesaler.
How can this be? Because lots of wholesalers sell on eBay directly to the public! Unfair yes, but its the reality.
What can you do about it?
* Order in bulk quantities to drive the wholesale price down
* Sell on another auction site other than eBay; there are heaps to choose from and profit margins are usually better. Craigslist is also a good place to sell if you live in the USA. (Let us know if you need more suggestions for places to sell online)
* Buy liquidation: this lets you get product for pennies on the dollar. (I'll let you in on a secret, this is how lots of powersellers make money on eBay these days)
* Find a niche market with few competitors' collectibles and one-off items have amazing profit margins, even on eBay.
These days, you have to be pretty savvy to survive on eBay, so I hope we've given you some ideas.
Sing out if you have any other questions and we'll be glad to help.