Help!!

Help!!

please i nedd help!! i want to create a mobile application  (support: Android 2.3) and i don't know haw to start...
what technologies do i need???
jqm+phoneGap+???
do i need SDK and java and Json....please help!!
it is not complicated the idea of the application just transitions and pages and buttons and access to data base to get the informations of a client for exemple..thank you.