Connect APIs with AIR and AS3: AdMob and Twitter

Hello, I'm currently making an application for mobile devices using Flash, AS3 and AIR. With the application I have no problems, but that to connect to the API is driving me crazy. I can not get it right. I am looking for someone to help me implement the AdMob API and Twitter in my application and explain to me how. The explanation is simply commenting the code to know who does what and the order in which you have to do to successfully connect to the API. With the Twitter API should only send a tweet. Should not send pictures or weird stuff, only send messages to update the timeline. I send a generic app, with a couple of graphic elements, but no code. Just have to connect with the API and display the results in case of AdMob and send the tweet in case Twitter. With this code, I used to implement it in my final app. Greetings.