There are a number of ways to make money online within a couple of days. Here's one strategy you can use to get at least $500 per day and up, and only takes a couple of hours to impliment.
What it is, is that you play the middle man/woman between a freelancer and someone in need. For instance, you can place ads in local newspapers, craig's list, etc ... to offer your website building services. I'd start out at a low price for now until you get known, and build a good solid list of freelancers.
Once you get maybe 3-4 prospects who want or need a website built for them, you take their order to places like DP forums, elance, or other free lance sites, and post the specifications for each site you need built as an individual job. Then recruite a freelance site designer to take on the job.
Of course you want to check out the freelancers who offer their bids before you do any business with them. Once you do get a good one, give them the job, and after they build the site to the specifications and head on over to your prospect and show them the site that was just built. If they like it, ask for payment, go back and pay the freelancer, and send the prospect the site.
You keep the difference between what the prospect sent you, and what you paid for the freelancer's work. This usually adds up to about half of the cost. So if you charged your prospect $300 t build a site, and the freelancer charged $100 - you keep $200.
You also don't want to ask your prospect for any money upfront - ask for payment when the job is completed, and they are satisfied, otherwise you will get in a jam, and owe them if they are unhappy with the site they received.
You can charge more or less to your prospects depending on what kind of a site they want built. That's your choice. BUT if you are new at this stuff, I would start out with simple sites and charge a couple of hundred to the prospects.
Btw, you can build a site for your services or blog too, and once your prospects are satisfied with the work, ask them for a testimonial so you have social proof for your services. This way when other people find your site, they already have comments from other prospects about your business and work. This adds weight to your credibility.
This straegy does work very well for bringing in quick cash, and is easy to impliment. It should only take you an hour or two at best to get the first bacth rolling, then by morning or the following day, you should see some money in your account.
Then it's a matter of wash, rinse, and repeat the process as often as you want to.
