How to create schematic symbol:
start capture
choose file->new->library
select the .olb file in the window, right click -> new part, select name, click ok
in menu choose place -> pin
use line to draw the shape of the symbol, then click save
How to create footprint:
choose file ->new, enter name of the part and select Package symbol, click ok
on the top right click a circle with + mark named Add pin, in the options toolbar on the right of the screen select a padstack that will be used for that pin. A padstack defines the shape of the pin, whether it is through hole or smd etc.
then right click -> done. After that you can draw outlines, silkscreen, keepouts or anything else you want.
Clik save and you´re done.
Then you need to add the library and package into the design.