Hi If u want to start with Mobile Application testing then u need to start from
What is a Mobile Application?
Type of Mobile Application(Native,Hybrid,Web Apps)
Type of Testing that can be done for Mobile Apps(Like Interruption,Compliance,Functional etc...)
How a Mobile Apps testing is different from desktop Application testing?
Challenges in Mobile Apps Testing
Mobile Test Automation Framework
Tools for Mobile Apps Testing(Robotium,Sikuli,iphoney,Fonemonkey,Selenium webdriver,UFT(new version of QTP) etc....