Enjoy having fun with stamps! That is the name of this game. Wonderful you are carrying on your father's collection. You are the next steward of a family treasure you can pass on to future generations. Its value as a family heirloom wil always surpass it monetary value.
Collecting for the enjoyment of collecting, whatever that might be, is the name of the game. Don't hesitate to ask questions especially if you need basic information and especially more advanced sources of information for any possible topic. You should be able to find folks on this board a little further along on their collecting journey glad to share experiences.
My personal bias is a used stamp loses the story of its journey in the postal service when it is removed from the cover it transported to its destination. Collecting postal history adds a whole new aspect to your journey in our hobby.
Wishing you many enjoyable future days in our hobby. Russ