Work hard. Internet is open field. If you want to win - you need to work more than your compertitors. 

Try SEO, PPC for promoting your business over the internet

as I earlier said, seo is the best way of online marketing there are so many people already obtained good result that includes various  ways such as if you have website for legit online jobs then you should concentrate on exact customer

The same as you said already, some article writing and some other link building strategies, like social bookmarking and social media. Somehow it comes all together.

My business isn't an online business (I'm a Realtor) but I do work for a company that does marketing for online businesses and what I've learned appllies to both. First you have to drive traffic (visitors) to your site.  This can be done through a combination of paid search, banner advertising and/or SEO (search engine optimization).  I'd done mostly paid search for years with Google Adwords and just in the last year learned about and implemented SEO on my site.  I had done some article marketing for the last few years but was not consistent and did not know the way to do it properly but now have learned how to be effective with that.  One thing I learned very early on was that I had to find out what people really wanted when coming to my site and it turned out to be that they just wanted to be able to look through listings on their own of properties for sale so I arranged my site to give them that right away.  Many other Realtors have extensive information about themselves or their local area on their homepage - I just put the registration for accessing listings front and center and have gotten many comments over the years about how people like my site. Secondly you need to determine what result you want with your visitors.  Do you want them to opt-in to a list, call you, purchase something, etc.  Your site needs to be designed to move them easily and smoothly through a process to get that result.  For my real estate site there are 2 things I want - people to call or email me and people to opt-in to my list.  So I have my phone number prominent and the opt-in as a requirement to access listings. Next you need to provide something of value to get visitors to provide you with their information.  Again, what I provide is access to listings.  For someone to view listings they have to provide me with their name and email address. Finally, you need a system to stay in touch with everyone who provides you with information and provide them with something of value when you do.  What I do is send out a monthly newsletter giving the most recent sales statistics for my area with a chart showing how this has changed for the last several years - this gives a factual and visual description of the condition of the local market - and then I cover a topic such as how to properly prepare for buying a short sale or foreclosure.  I do have people call me up within a short time of registering on my site as they are ready to buy right now but most of my clients contact me many months or years after they first registered.  The most common thing I hear is how they are now ready to buy and that they've been receiving my newsletter for months/years and enjoyed reading it and feel I know what I'm doing.  I don't used any canned newsletters, I write them myself every month based on what is going on in my market. You can set up a drip email campaign (a series of emails that go out at predetermined intervals) or do a regular newsletter, but whatever you do you should have some way to stay in touch with the people that visit your site and provide them with something they would consider valuable.  The cost is in getting people to your site so once you do you should make sure to get the most out of what you spend and the best way to do that is to get them onto your list and continue to communicate with them on a regular basis. With all that in place, now what I do is seek other methods of driving traffic - improving my paid ad results, testing other paid networks, testing banner retargeting, various SEO techniques to improve my rankings in the organic search listings.  Even though mine isn't really an online business all of these things apply and can be used by you.

You should also throw some Directory Submitting into the mix. Some directories have high PR which is great for the engines.

Social network is the right answer to promote to, both get a lot of traffics and do seo at the same time. You are in the fast lane.

We have had a lot of luck marketing on discussion boards that are very related to your products. Thanks, Cory http://www.tdazzled.com