I completed my website about two months ago and decided to make use of openx to serve ads. Once I got that figured out, I joined a South African affiliate network and used their banners as advertising.
I also created an "Advertise on this site" page, just in case someone wanted to advertise.
This way, the site doesn't look too new to potential advertisers and you have the knowledge of fairly advanced adserving. I have now contracted an online media sales company to manage the advertising sales, so I'm excited to see what they bring in.
As dani said the best thing is to establish your self in the market before starting to ask for sponsorships. Once you start getting a steady stream of reliable visitors then more peoples will become intrested in advertising on your website.
But if you want to make a buck or two why not use google adsense or affiliate banners.
Well i think price will be based on how many visitors visit your site and it varies on what industry and type of website you have. Another way to get a idea of price is to search on your competitors websites and see what they are charging advertisers.
hello dani am by the names of lwasa phillip a ugandan by nationality i hav a small ngo which supports aids patients and being a IT PERSON I WOULD LIKE TO be support with new comptures and hard wears plus some few dollars to help thes brothers and sisters of ours together we can change the laeving and put an end to this virus