Were they visible yesterday, and have they now disappeared?
Or did you list them yesterday and they have not yet disappeared?
It is normal for listings to take up to 24 hours to 'index' and appear on the site.
It takes longest for new sellers, for sellers with a poor record of violations, and for sellers in high-value/ high-fraud categories.
Did you know that if your items sell your customers' payments will be Held by Paypal against your good performance for 21 days.
You are required to ship promptly on payment (not on your receipt of payment) however. To help with this you can print a shipping label through Paypal as soon as your customer pays, and the cost of the label will be released.
As an aside. Selling on eBay is more complicated than the site pretends. It is a good idea to do some buying on the site before attempting to sell. Not only will this allow you to see the experience from a buyer's point of view, but also you will build up your feedback which helps customers trust you.