Working with already existing Campaign

Hi Using sandbox, i could create, campaign,addgroup,add, keywords. I could retrieve the cpc and impressions also. I have a running campaign in ad words. In order to retrieve report fields from a running campaign created using adwords GUI what i have to do in development environment? How can i ref

Can i able to set my budget of Campaign

Hi I want to manage my adword campaign through application program. I wish to reset the budget for both daily and monthly as well as i wish to retrieve informations such as number of clicks/day and amount spend per day through my application program. Can this possible? I already have a campaign i