My own SEO strategy to get indexed fast?

I have been running a few old sites (3+ years old) and new sites (less than 1 year old). You can’t apply the same SEO tips for old and new sites.
They don’t work the same. I mean, I can submit articles or new pages to social bookmarking sites 5 times a week. However, I can’t do the same with new sites.
If I submit my new sites to social bookmarking sites too often, I will get reindexed. If you want to get indexed faster, then don’t try to get many back links for new sites.
In other words, I can’t get many backlinks too often for new sites.
Am I wrong?
Any idea is appreciated.
Thanks and have a good day!

Yes to get index faster you need to create backlink, free articles submission is very useful.There are many free articles submission site which accepts free articles.one of my friend suggested me http://www.basearticles.com which accepts free articles.