I have found that content is most important in these days for search engine and you can submit your content on web by weblogs. There are many blogging script which you can use to commence blog on your website and can supply useful and quality contents for your visitors which will enhance their knowledge or should at least make some contribution to there know how about your product and services.
The common platform to build blog are wordpress and Blogger both are free to us.
Now question how to get the free content for you weblog. The best idea is to invite the guest blogger for contribution to your weblog or blog. Guest blogging service agency can help you to solve this problem. Guest blog posting is free concept where you get free content for your website from experts bloggers. In return you will have to just publish there name or website name
You can use free blog ping sites to submit
For manual submission to blog collection sites you will beed the help of blog submission agency