Welcome to SCF!
For some good advice, I suggest you post your question in the main part of the forum, or use the search function to find older threads which have discussed the issue. Here's a good one
https://goscf.com/t/14756&SearchTerms=hingeMy personal view would be that if your collection is hinged, I would leave it that way, at least until you get into the hobby a bit more and are ready to make your own decision. Mounts are very expensive, and personally I think you could spend that money on some more stamps and other basic stamp equipment to get you started int he hobby.