Find something to sell
The first step is to find a product that you can sell, and that really is the hardest part. Clearing your house of unwanted items and listing them on eBay is fine as long as there are items to sell, but it is unlikely to give you a full time income. Some people trawl charity shops and car boot sales to find second hand goods to sell, but these are unlikely to make a huge amount of profit for a lot of work.
You need a good source of products that you can advertise and sell and that usually comes from drop shipping catalogues. You need to find a provider that has items for sale and sign up to their service. It is worth doing your research before paying your membership, but this can be a little tricky without knowing prices.
Picking an item that is wanted
Ideally you want to find items for sale that are not flooding eBay already. And this is not all that easy as there is a fine balance. If the items aren't already for sale there is there a reason? Are they unpopular, too expensive or just not selling? If they are selling well then there could be loads of people jumping on the band wagon to sell them.
A little bit of research at this point will reap the rewards in the long term. The products that you are putting up for sale should not be being constantly listed by different sellers and ending in unsold auctions. If you start advertising these products there will be even more competition for the few sales and your profit margins will be squeezed.
But, find a suitable product to load and you can give it a good description and hopefully it will sell first time and every time. With experience you will soon learn what of the merchant's catalogue sells well and what doesn't and be able to concentrate your activities around the items that work.
Process your orders
Then all you need to do is to wait for the auction to end and the buyer to make the payment. You can send an invoice through the eBay system to remind them for payment if they are slow and once the money is received, you go to your drop shipper and give them the order details and tell your customer that the order has been processed and is on the way.