Using a niche site builder, you can essentially create search engine friendly pages which means your pages and content are ready for the search engines and are formatted correctly which has to be done if you want to get traffic from the major search engines.
Depending on how big your market is, using a niche site builder with original good quality content can help you dramatically in gaining exposure from the search engines and getting the traffic you need for your website to be successful.
Remember, without traffic, your website is nothing but you need quality traffic that you can convert into buyers and for a beginner this is not such an easy task so, by using a niche site builder you can create a website that is well formatted and this leaves you more time to work on your off page seo, IE link building.
There are plenty of niche site builder programs out there that will do everything you require to create a well formatted website and there are a couple you can download for to try that will do just fine until you are ready to progress onto buying a program.
Something else you need to do before you start working on your new website is keyword research. This is vital so you can narrow down tighter markets that has less competition but have a good amount of traffic, you can then build your website around these keywords which will give you a better chance of delivering a product that someone is looking for.
If you are just starting out, I would recommend the cb niche builder program. It is simple and easy to use and can help you build clickbank websites or landing pages in a matter of minutes and it comes with video tutorials that explain how to use the software.
Don't forget once you have built your website, got it indexed with the search engines you need to start building links to get those niche sites ranking high in the search engines and you can use methods such as article marketing, social bookmarking and web 2.0 properties to promote your offer and boost your link popularity.
Article marketing is one of my favourite methods because it is free and with non competitive markets, you can obtain great rankings in a very short space of time and does not require a lot of work to get things moving.