Domain name Length

[innofidelity]

How many characters max per domain name ,is that important factor ?

[danatanseo]

It's very important if you plan on doing any advertising at all, whether it's Google Adwords, Facebook or anywhere else. Aside from the fact that shorter domain names are just easier for your visitors to remember, many advertising networks have character limitations on display URLs. For example, Google Adwords has a 35 character limit for display URLs. You can have a longer URL, but it will be truncated in the ad, which isn't really what any advertiser wants to happen.

I'd say 35 characters or less for your domain name, counting characters like this:

MyDomainName.com

Don't count the "http://www."  part  in your character count because you can omit that from a display URL in an ad and people will still understand it and be able to navigate to your site.