Try and look at the faces to determine manufacturer.
If they are antique mechanical watches they will have a screwback or pop-open rear case. The movement inside will be labeled with manufacturer, model, and serial number that can often be looked up online to determine rarity.
Pocketwatch cases were often made by jewelers and not the watch manufacturer, so if the face isn't labeled the only way to check for manufacturer is to open the case.
If you are clean and careful you can do this yourself, there are no doubt youtube videos demonstrating the technique. It isn't difficult, but if you are a clutz or in a dirty area it isn't a good idea as each mechanism is a finely tuned machine consisting of hundreds of synchronized moving parts.
Once you determine manufacture and age from the serial numbers, look up similar sold watches on Ebay. As a general guide they could run from $20 to $500 apiece depending on what they are, so it is worthwhile to identify them rather than sell them as a lot.
ETA: If they are quartz pocket watches they may be worth $5-15 apiece unless real gold.