dont warry about domain thing duo to vocations its taking time as it will be active till Monday , i dont have such money but we are team of programmers :) all we have is skills and trying to make money for living any way best of luck with ur idea looking foreword to see it sooon ..
I agree programming skill is important, but I recommend you to take your plan more as a business project than a web-building one. Beautiful design or powerful functionality maybe very attractive to your visitors, but I think you also believe "good deal" is the key to success. Nobody cares (even artists) the design of the website, but only the deals you can offer.
You will be the tie, connecting companies and customers. No company will be interested at you if your site has limited visits, no visitor will come if you don't have offers from companies. A good design or functionality of your site can be easily imitated or even copied, which won't be unique to you any more. Only your network, your connections with companies as well as your visitors (newsletter subscribers) are hard to be imitated, copied or acquired. This is the sustainable competitive advantage of your site. Sorry to say that, but I can't see the programming skill is not your strength in this context
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But I think you are right to start with a specific focus - restaurants in Copenhagen area - as you have limited budget. Your site might be the exclusive for customers to get good deals to eat in Copenhagen.
I didn't know sweetdeal.dk until I read your post, but, for your information, I know downtown.dk and takeoffer.dk - who are your competitors.
I hope my contribution may polish your view in this business.
Good luck with your project. I love to see the success of your site as a consumer - more competitive it is, more good deals I can choose.