Determine which output-format/media you want
(CDs, files, DVDs, ...).
Determine which-outputs your-8mm-camcorder/VCR has:
Composite, FireWire, S-Video, USB, ...
Check whether your-computer has appropriate-inputs matching those-outputs;
then get an-adapter or video-capture-card with appropriate-inputs
and appropriate-video-editing-software (usually-bundled-with).
Play your-8mm-video-tapes & capture with your-video-editing-software,
then edit/split into more-manageable "clips" or "scenes".