For high quality transfer, you'll first need a player that can output s-video, then you'll to buy one of these
tbc to fix jitter on playback if there're any. Then buy one of those s-video to pc device to connect to your pc.
After that, you can start to record your vhs using program like Virtualdub2. Make sure that your recording is not over or underexposed, or not oversaturated. Also make sure the light and dark details are visible.
After you get the raw video, then you can do the color/brightness/contrast adjustment in the video editing software like Premiere.