I am fairly new as well, generally any hardware used with an arduino is well supported with a library of functions which will also usually contain example sketches to get us going with the new toy. SO track down the libraries supporting your hardware install them into the arduino ide (copy into the librarys folder and restart the ide) And you will probably find an example sketch for your hardware within the examples menu.
this is great as it gives you a shoe in on how it works, and copying the example and modifying it step by step into something useful to your project allows you to test your progress as you go,
Start with this..
mpr121 hookup guide
for creating your buttons,
and have fun..