Hi Gilly,
You should be thinking about getting content onto your pages before you wonder whether you should start paying for adwords
If you build your pages to be 'search engine friendly' then you can reduce the necessity for adwords by ranking well in the search engines - if your pages are not built well then adwords may be your only option to drive traffic to your pages.
Are you building the site yourself?... or do you have a web designer doing it for you?
regards
James.