Hi JohnsonOng,
This question has been discussed in a past forum thread, and I am reiterating Alice' advice that it would be fine to sell a range of items on eBay and on other marketplaces, however, if you want to sell in your own website, it is wise to focus on a particular product market. And the main reason for this is for search engine optimization. Kindly refer to her full post at Link hidden: Login to view
Let us know if you need more help. :)