Hi..I normally suggest to people that ask, to start with what they like and know. However if your market is too saturiated with that item, then it would be indeed better to start with other items..
Here's a tip. Did you know that a very, very large percentage of shoppers are 'impluse' buyers. They go to wal-mart to buy a pair of jeans and come home with a whole new wardrobe.
Here is how this benefits you. Most people buy stuff on impluse. Then after they get it home, they quickly lose interest in it, or decide that they don't really need it. So what do they do?
They pile it in the closet or garage, or under the bed. Eventually they run out of space. A good percentage of these people will list these items in their local classified ad, or want ads.
Most of the time, they don't really want what it is worth, they just want it out of the way.(gotta have space for the new impluse buys)
You can browse you local newspapers and find these items. It might be video games, movies, clothing, whatever and will more that often be listed at a fraction of their value.
But you don't have to just take a chance. If you see a few items that iterest you. Just go to ebay and do a completed listing check on that item. If it's selling at a higher cost that what it is listed for in the want ads, then you can purchase it and resell it on ebay at a profit.
Better yet, an even faster method, is by using auction inspector. It's really fast.
I have a friend who uses this method as his full time income and does very well. Spends most of his day in his pajamas browsing want ads at the kitchen table.
I'm sure that you have been to garage sales. You often find really good items for sale very cheap. It's just stuff that was taking up space and they had no interest in, so they put it out in the front yard for sale just to get rid of it.
The only difference here is that you don't have to drive around town looking for yard sales...