Advertising online business? How? Tips?

I recently just opened a new online business, but I don't know how I can advertise it on the internet. How can I do this? Hopefully either free or somewhere that is cheap, I can afford some cash. It is a gaming computer building service. Where I build gaming computers for customers based on their budgets. Ive had a few customers but they were people that I already know. Any help is appreciated! Thanks!

Good suggestions, thanks stebbinsd.

Arpita I already have a domain:

gamingpcbuild.com

The key with advertising is to know your audience. For example, gamers often eat candy and drink soda while they play, so Nestle and Pepsi are just as good choices to advertise on as Gamespot or Dell.

Google is a great place to start with your ads. Most people who want online custom gaming PCs will first do a google search. Just make sure to use sponsored listings, which cost more, but guarantee you'll be at the top of the listing.

You can also advertise banner ads on various sites such as computer message boards and game critic sites. Also, advertise in magazines like Game Informer, because these are people who probably already use the Internet, and let's not forget junk food manufacturers, as well as restaurants like pizzahut.com, since gamers are likely to be too busy playing to cook, so they'd rather order a pizza and get on with their games.

I like Stebbins answer.
Quick money always has a catch to them. Go with Stebbins answer.

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My husband is a member of an Internet marketing community called Wealthy Affiliate ($39.00 a month). It is like a school for internet marketers (including beginners).
There are a lot of people in it, that know what they are doing and everybody is trying to help each other. You can learn so much there. The forums, the support, the coaching, all the information they provide you with. You can find the right answers for most of your questions regarding online business, advertising, etc. It is a great program.
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Plenty of forums sites and craigslist.

I get the whole confusion of yours.As per my experience is concerns,I just want to suggest you two ways you..
Google Adsense is a tool of google for advertising.All these advertisement are moderated by google and revenue on pay per click or per impression basics..
AND
Google Adwords includes all local,national and international distributions.It is flagship product of Google for advertising.

1. Register a website. This is the only expense that you will initially have and it's worth every penny. This is vital to giving your online business a professional feel and for less than $10 a month you can register a web address and get the pages hosted.
2. Create a blog. A blog is short for web log. It's an online journal of sorts that anyone can read and comment on. Some bloggers make over $100,000 a year by ad revenue. The most common source of ad revenue is Google. The easiest way to start a blog is through Blogger.com which is owned by Google and completely free.
3. Build your own industry specific news group. For example, a news group about sports equipment. You could run articles about the latest equipment that is coming to market. Sell ad space in the articles to sports companies. Also offer press release publication for a small fee to the industry.
4. Sell products from your website. This could be anything from homemade crafts to items that you purchase at wholesale and resell. One of the more common methods to do this is to get connected with a "blind shipper". Basically when someone places an order with your website, the request is sent to a warehouse and your label is placed on it.

Have a nice day

Have you thought about employing an agency who specialise in online marketing? They would know the best strategies and help generate more advertising/revenue for the business.

The best thing is to have multi-angled approach to your advertising strategy, use a variety of online marketing tools to achieve the maximum success.