I want to create a new blog but ? (google ads)?

Google will accept any kingof blog you create so far you have great traffickand rich content on your website, which is should by fact tell you doesnt come easily, but to be accepted for thegoogle adsense program i suggest you read this http://hupages.com/hub/how-i-got-accepted

you would fine or choose a topic that you are capable of producing many amount of contents. Because search engines especially Google likes blog that have high amount of contents and that are updated regularly. If you choose a topic that you have a hard time dealing with then its better if you find another. Choose a topic that you can easily update.And make sure that the contents are original and not copy pasted somewhere else. Then you can apply Google ad-sense for your blog.

Ads are selected to match a page's content, pick subjects that have commercial value, news and celebs look weak in this regard, some lookup highest costing Adwords PPC keywords and put those terms in articles, unfortunately they are more particular about those $50 medical/legal clicks and don't actually pay more than a couple of bucks fore such adsense clicks.