A place to start:
My suggested first step is to put together a complete list of of what you have inherited and the condition of the magazines. Are they bound or individual magazines? Are any of them reprints? Once you have shared that information, others should be in a better position to offer their opnions on the value of what you have.
Is your collection still available? Where are you located? I'm in Bancroft, Ontario, Canada.
My e-mail is: firstname.lastname@example.org