Your first and perhaps most critical initial consideration
is to find a product "leader" that you can sell at a bargain
price (preferably $2 or less) and still make a reasonable
profit.
It should be something that can be adequately described in a
small inexpensive ad and serve as a "door opener" to allow
you to offer a additional products to customers who have
demonstrated an interest and willingness to buy that type
of product.
To illustrate this point, we will use a 15 section eye shadow
case to sell for $2.00 plus 50 cents Postage and Handling
(P & H). These were advertised recently for $12 per dozen
wholesale (GEM International - see Business Sources) or about
$1.05 each with postage. Although you will "gross" 95 cents
apiece on these items, your overall profit will not be
significant on this sale alone, when you consider the cost
of advertising, your time and effort to obtain, process and
sell them.
Your real profit will come from subsequent sales to the same
customers -- your "captive audience"!