Been collecting stamps since I was 12. ( not so much in the last 20 years though ) US mostly ,but my grandad has a collection of foreign that he gave me that was pretty impressive. Like anything it's all about demand . rarity and condition. It takes alot of time and effort to appraise a decent sized collection and it may cost you if you have an expert do it. no one could just throw out a ballpark figure and there are very specific grading standards for them just like coins.
i often though about selling my collection but stamp collecting is all but dead ( except for the most sought after examples specimens ) kinda like baseball cards so i would not get much for them I expect.
good luck in whatever you decide.
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