Unless specifically a web based business, a fairly large number of new startup businesses tend to ignore this aspect of branding and building a business.
And though it is probably still possible to be successful without having a web presence, the importance of having a presence online is increasing so fast that not being there will essentially prove to be suicide for your business.
If nothing else, not being online will no doubt stunt your growth and longer term survival significantly.
The amazing thing about this is that it is really much easier than you think.
A few suggestions of how to achieve the best possible results include:

• Online telephone directories.
  There are numerous out there including Yellow Pages, and several others that may be more local to you.
  Make sure to submit your basic business information including contact information to as many of these as you can find.
  People are using online searches to find even telephone numbers.
  Phone books are definitely the past.
  
• Blog.
  This is simply one of the easiest ways to start building your business and brand online.
  There are loads of free options out there with simple submission capability that will allow you to establish your business as the go to business.
  Write articles, add photos and videos of completed jobs or just showcase anything you think your customers may be interested in.
  If you do not know how to do it, search for the answers on Google.
  Search for "how to blog", "blog hosts" and run from there.
  Then start creating your masterpiece.
  Sooner or later the search engines will find it, and before you know it your name will start popping up everywhere.
  One of my favorite blogging hosts for doing this would be WordPress.
  It is easy to use and works like a charm.
  It could also easily serve as a website if you do not intend to set one up, for the time being.
  
• Social media.
  Make sure to get a profile on as many of the social media sites as you have time for and create company and profile pages on each.
  A few that come to mind are Facebook, Google+ and Linked In.
  You can also use these to connect with customers and not just friends and family.
  And I would urge you to do so vigorously.
  
• Profiles.
  Most of the places where you are able to submit articles, blog or just add things about yourself, will provide an opportunity to do a profile write up.
  Make sure to use this to properly showcase your business and who you are.
  This will all add to credibility, which will grow with the age of your submissions.
  
• Expert forums.
  There are simply loads of forums out there for every possible topic under the sun.
  This means you can simply join a few of these and start answering questions about your field.
  Do make sure to participate in the forums that are related to what you are selling.
  And remember to have a proper profile on each of the forums where you participate.
  People do read profiles of people that seem to have some idea.
  
• Article submission.
  If you are so inclined, write a few articles and submit them to article submission sites like EzineArticles.
  There are several, and they also allow for a profile that enables you to promote your business, and contact information.
  
• Your own web page.
  Although this could be an expensive endeavor if you decide to hire someone to do it for you, for the most part it is not difficult to do.
  This so since more often than not web hosting companies offer free web creation software with their packages, making it possible for you to create spectacular pages yourself without knowing a single word of code.
  If you have any experience with some of the Microsoft packages, most of them will allow you to create a decent presentation and then save it is a webpage file, which you can then simply upload.
  I would most certainly recommend that you have something.
  Not having a website will give advantage to your competition and quite possible lose you a lot of business.
  And do not worry about keeping it simple.
  A few pictures, some basic information about your business and clearly marked contact information will often do the trick for a start.
  

Notably there are several more things that you could do to get your business established online, however starting with this will likely have a significant impact on the success of your business forward.
I wish you all the best with your ventures and invite you to share comments and stories here.
Cheers!