There are ways to sell goods and services on the Internet that don't require the visitor to call. Many people are happy to give their credit card information online these days, as long as the information is collected on a secure server.
In its basic form a shopping cart could be just a button or a hyperlinked piece of text that takes the visitor to an order page. Most of the time, you can add more things to the page.
There are a lot of commercial shopping carts that use templates, and they can look very professional. But before you choose one, make sure you compare all the features. These solutions are great for a trader who sells a lot of similar items and wants to be able to change prices and add new ones often. They also give you a lot of freedom to make them fit your website's style by adding logos, images, etc.
To accept credit cards, you need a bank merchant account. These accounts have very strict rules about who can join, which can make it hard for smaller businesses to get one. Why not use PayPal in these situations? This lets you accept credit cards without a merchant account at a bank. It can be very cost-effective because you only pay for each transaction and not a monthly fee.
Some companies offer a full e-commerce solution, which includes the banking side. If you go with one of these companies, make sure it can connect to your business bank account. Some banks won't let people who work from home use their merchant facilities, which makes these options very appealing.
Just a word of warning about charge-backs. In this day and age, when card fraud is on the rise, it is the store that loses money when a customer gives false information or disputes a transaction. Before you accept a transaction, you should do everything you can to check the information a customer has given you. The Internet makes this much easier than it used to be. There are websites that let you check phone numbers and addresses against official databases for a small fee. This is something you should always do with a new customer until you've worked with them before.
