No where near enough detail to consider a quote.
For starters, what type of advertising are you planning to use? Will it be simple banners and skyscrapers, text ads or video, will they be search based or fixed, how are planning to collect the revenue and make payments, market the system and convince site owners to carry your adverts.
Taking a rough guess, I'd put the start up cost at £10,000+ with a marketing budget of £2,000/month.
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