It's easier than you think
Recommended Reading

These books are an excellent way to get a head start in your research.
DIY Articles
Choosing Products

Wholesale
World Wide Brands, Onesource
If you are looking for a drop shipping source, this is the mac daddy of them all.  Why would a
Manufacturing site recommend a source to buy products?  Well because you will find out after
carrying certain brand products that you can make your own version of several different products.  
By using a drop shipping company you can shortcut your research time even more.  You can
subscribe to the one source directory for a life time membership of $249.  This will give you some
great ideas of products and sources for you to get them as well.

The general problem with using drop shippers is that you really do not know who is trustworthy or
not.  Handing over cash to a questionable company and hoping you get what you are after is not a
fun way to do business.  All the drop shippers in the worldwide brands database are scrutinized
closely.  You will not find any vendor that will not deliver.  If so you have an intermediary to help you
in case there is trouble.  The worldwide brands database is always growing as well.  If you do not
see what you are looking for one day, try again a month later and you just may find it.  It really is a
good and easy way to test a product.

Another option as you progress with selling is that you could eventually register and qualify with
them to become a drop shipper yourself.  This gives you many more options and a potential growth
factor for your business.