To get high search engine rankings, you should be providing quality inbound links to related, quality page contents. Make sure to always build links and the more you can get without spamming, the better. Studying the competition will help you get a higher ranking faster, and you won't be doing it blindly. Make sure to also look at page structure, content, and so on.
The more social media properties the better
In your marketing efforts, it is also important to take advantage of the social web to build links and your brand. The more social media properties the better, but you want to make sure that you can handle what you take on. Having 10 properties is useless if you do not have the manpower or the resources the man them and keep them up-to-date and interesting to your audience.