Lots of good advice here so far, and may I add..........
Sounds like your Dad collected the classical era, which runs from 1840 (Great Britain) to 1939. Having "only" about 2000 stamps in that collection tells me that chances are good most - if not all - are what I would call "the easy ones". With that, a dealer would offer you very little - maybe $50 or so. Taking some good pics and listing on
ebay might bring in $200 or so. Know this, there are hundreds of stamps out there well over 100-120 years old that have minimal value.
Of course all that depends on them (including the album) being in good condition.
Unless you are forced to liquidate, I would put the album aside and take your time to enjoy it. You might even pick up on the hobby, but at least you would give some time to enjoy what your Dad worked hard to accumulate.