HOW MUCH PER MONTH MY AD WORDS[ Edited ]
April - last edited April
There is no monthly minimum in AdWords. The typical options most frequently used by advertisers allow you to fully control your bids and daily budget. Hence your monthly spend may be anything from US$0.01 at the low end to astronomical numbers at the high end and everything depends on your settings.
I'd strongly recommend you to go thru the material linked-to below.
*** Your guide to AdWords ***