Banner Advertising is a great way to earn a stable income from your websites every month.
If you have not already try advertising on your website, you should! Whether it is google adsense or ads networks which pay by impressions or clicks, you should try them on your website for at least one month. You never know, you might be able to generate a substantial income from these.
I personally think if you want to earn a stable income from advertising, you should offer spaces on your websites (like the right column, top column or the bottom of the page) where you charge a fixed amount of money per month for advertising. For example, you might be offering a space for a 125×125 banner for $10/month at the right column of your website. You can also offer spaces for text advertisements.
But of course, to take benefits from this, you will need to find advertisers on your own. You have to post an ad on your website or post in forums stating that you are offering advertising spots. This surely will take a lot of time and efforts. So my suggestion is to join a banner network. You don’t need to find advertisers; they will handle that for you. The banner network acts as a middle man between advertisers and website owners.
Money4Banners is a good example. It doesn’t matter if you site is big or small, has high or low traffic, as long as you keep 3 banners on your website, you will receive $5 per month. I think it is great for new webmasters. If you have several websites, you can quickly generate a stable income from this.
Start from here, and continue building your advertisers list. Making a full time income from your websites should be a piece of cake!