I have my blog setup and adsense currently is making money on it, I wanted to test it on my blog before i implemented it on my webpage. Do I need to do anything special before I enter the code on my real webpage or will it work as is right now? Also can i put irrelevant ads using adsense. Like if my blog is financial and I want to put 2 financial ads and then 2 travel ads can i do that manually?? thanks
You can put your adsense code on as many websites as you like, place the code where you want the ads to display and you're ready to go. You can't choose which ads you will be displaying, adsense does that automatically for you.
Yes, you are allowed to do so. There is no need to notify Google if you want to put adsense ads in new sites.
One account will cover all your ads, regarding relevancy, adsense supplies ads depending on your content. If you want travel ads on your financial site your going to need to ad travel content, maybe on a new page or something.