The bigger challenge is creating a site that attracts enough traffic to make the ads worthwhile, some sites average 1 penny revenue per visitor, but get 10,000 visitors a day, More realistically a niche blog that's relatively easy to get search ranking might be getting 100 visitors a day after some months.
Google's Adwords is the most popular ad source for freelance bloggers, you can set one up on Google's Blogger.com for free, unlike most 'free' hosts you get the full webmaster's ad revenue.
Just make a website, contact companies and ask if they want to advertise on your page. If your site becomes popular, they'll ask you instead
First make your website.......Then apply for google adsense or yahoo ad networks. Use wordpress for making website easily. You can use 'Ad Optmizer' wordpress plugin for generate Ads.
http://freeost.com/ is the best I can list because of its very fast registration process. You only need to fill in a very short form and there you go , 5 seconds and you host your website.
I need help to make a website and I don't know what to start with.If you don't know what I mean then I mean that I just need a Website that has a bunch of ads from different webs and companies.