I have a turntable that will play 33 or 45 or 78-rpm records (vinyl),
and an excellent audio-USB converter
which goes into a multitrack recording program on my Mac. 
I use the same setup to get the audio from your cassettes.

Then I can 'normalize' the volume, apply noise-reduction, and cut the audio into tracks.

I then export the tracks into the audio file format of your choice (including track names and numbers, plus detail 'tags'),
and get them to you to enjoy via the net, USB 'jump' drive, CD, ???.

Caveat: if the vinyl is badly warped or has skips I can't repair, those are beyond the 'miracle' of DigitalSignalProcessing (DSP).

This is pretty straightforward for me (Audio Engineer w degree in Audio Production) - hopefully it will be of use to you.
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From wikipedia  https://en.wikipedia.org/wiki/Audio_file_format:
Three major groups of audio file formats:
1} Uncompressed audio formats, such as WAV, AIFF, AU or raw header-less PCM;
2} Formats with lossless compression, such as FLAC, Monkey's Audio (filename extension .ape), WavPack (filename extension .wv), TTA, ATRAC Advanced Lossless, ALAC (filename extension .m4a), MPEG-4 SLS, MPEG-4 ALS, MPEG-4 DST, Windows Media Audio Lossless (WMA Lossless), and Shorten (SHN).
3} Formats with lossy compression, such as Opus, MP3, Vorbis, Musepack, AAC, ATRAC and Windows Media Audio Lossy (WMA lossy).
(More loss = smaller file sizes, quality trade-offs. SP)