Make sure your on page SEO is complete.
this is one of the most important factors.
Without on page SEO, off page SEO is not going to be half as effective, if at all.
Valuable off page factors (once all on page aspects have been completed) include;
1. Search Engine Submission
2. Link Building
2. Social Media, Google Places is a must for business - get this fully completed and verified asap.
3. Get Google Reviews
4. Directory Listings
5. Social Bookmarking
6. Blogging & Content Marketing
7. Forum Marketing
Create high quality content and obtain back links using the above methods.
Make sure your content is unique and relevant to your target page / website, and don't over kill on keyword stuffing or spammy links.
Content is king and back links are vital - quality back links with good PR that is!
Solid SEO campaigns cover both on and off page SEO, which all begins with a quality user friendly website, based upon good keyword research.
Follow these basic principles and keep focused on maintaining a quality website or all off page efforts will be in vain.