Obviously, a site needs to have great content filled with SEO keywords and landing pages. But what are the best ways to increase search engine ranking by using other sites/blogs? I have looked into various gigs on Fiverr and also the profiles of several freelancers on oDesk that offer services related to SEO and increasing search ranking via backlinks. But it has been hard to figure out exactly what they do, and I feel uncomfortable asking total strangers earning poverty wages to handle this. I own about 50 different domains that I have no utility other than to help me promote other "real" sites. What are the best ways to use these sites? For example, is it helpful or harmful to setup blogs on these sites with articles that link back to the main sites that I want to promote? Since I own these domains, I would love to figure out how to best utilize them in a way that increases the organic ranking of my main sites.
I deal with small business owners on a daily basis. Their knowledge of SEO varies greatly as does their competition in the SERPS. I will tell you that it is tough to give complete answers without first knowing how competitive your niche is.
If those 50 domains are to be of any use, you will need to promote each of them first. Setting up a site without any promotion just to link to your main site is a losing strategy and one that will leave you pulling your hair out.
It will not be helpful unless those sites are individually promoted first. That can be a monumental task, depending on many variables.
My deduction, without the minutia... It sounds like a better investment of your time may be to promote your main website first through other relevant media.
All of this depends on many factors. Would be glad to help you sort it all out on a call.