You can purchase your own unique domain name from a variety of providers:

Here are some web sites that will help you create a unique business website name:

Next you want to select your web hosting company which will allow your website to be accessible on the Internet.  Web hosting companies provide space on their servers and provide a variety of services including: web templates, utilities, email, and customer support.

There are many web hosting companies and they all want to compete for your business.

Here are some links where you can begin comparing web hosting companies and service providers for your web site:

There are many ways to learn how to build your web site but you must begin by planning the content of the site.  Decide what text, graphics, video, and other features that you want on your site.

Once you have an idea what content you would like on your web site, you can look at competitor's web sites to get ideas on how to make your web site design effective as a marketing tool.

Next you can purchase website templates online or depending on your choice of web hosting company, some  provide business web templates when you purchase their services.  

You can also perform an Internet search on Free Website Templates and you will be surprised what you can download for free but you will have to know how to customized the templates and what software tools you will need.

Search Engine Optimization (SEO) is the process of increasing the volume and quality of visitors to your web site.  This is done by editing the content of the site's web pages and using specific keywords that will be used by the search engines.

Search engine optimization of your web site will attract more quality visitors to your web site by making your web site and it's content more relevant for the search engines.