Look for a good place where you can put your inventory and shipping materials. It's a free eBay secret that they need to be in a safe, dry place nearby. Writing a daily To-Do List will help you organize your schedule. It is also the free eBay secret for you to manage your time on normal tasks and follow up on opportunities that aren't part of them.
Once you decide to become an eBay seller, choose the user ID you will have to use, carefully. Choose a User ID that represents your business or the items you sell. Your User ID automatically becomes your eBay identity to potential buyers.
Look up the "How to Sell" Tour and watch the eBay selling demonstration video. Then learn of free eBay secrets in starting up at the eBay Learning Center.
Taking eBay's fees into account may be the free eBay secret you need that'll guided the pricing of your items.
There's nothing wrong in promoting your eBay store. It is another free eBay secret that you design marketing materials to promote your store.