Welcome to the club ! Just hit the library and find the book that
seems to explain things best. You'll want to look things over,
disconnect the power, put in the boxes etc necessary. The thing about
electrical is once you know how to do it it's so easy as to be trivial,
but until that point there's the thrill of killing yourself or burning
the house down.

Follow the book, ask your neighbors who may have done some of this, and
proceed.

Note that in your area, whereever that may be, you may not be able to
do your own work. CA ?