just follow this step (i am not writing code just Bcoz you may do copy and paste and cant learn)..
first at all you need to declare a button which you have in layout
Give reference to that button by finding its id (using findviewById) in oncreate
setlistener for button (like setonclick listener)
last handle the click event (means start new activity by using intent as you know already)
Dont forget to add activity in manifest file
BTW this is just simple i would like to suggest you that just start from simple tutorials available on net will be better for you..
Best luck for Android